Fosi Audio K7 Gaming HiFi DAC Headphone Amp

kesobie

100+ Head-Fier
FOSI K7 Review: ARE WE GAMING?
Pros: The most practical Hi-Fi amplifier I’ve tried

Fantastic power output

Clean but lively sound

Microphone jack support

Informative OLED screen

Built in EQ

Dedicated mute button

Solid bluetooth support

Premium metal build quality

Dedicated buttons for many of the features

Intuitive controls
Cons: Shakey and cheap-feeling buttons

Not a lot of “gaming” features like app support, multi profile EQ, etc

UAC 2.0 does not have mic support

EQ is only limited to high and low shelves

No LDAC support

FOSI K7 Review: ARE WE GAMING?


KICKSTARTER PRICE: $153 (PHP. 8,300.00)


WATCH REVIEW HERE:



PROS:

  • The most practical Hi-Fi amplifier I’ve tried
  • Fantastic power output
  • Clean but lively sound
  • Microphone jack support
  • Informative OLED screen
  • Built in EQ
  • Dedicated mute button
  • Solid bluetooth support
  • Premium metal build quality
  • Dedicated buttons for many of the features
  • Intuitive controls

CONS:

  • Shakey and cheap-feeling buttons
  • Not a lot of “gaming” features like app support, multi profile EQ, etc
  • UAC 2.0 does not have mic support
  • EQ is only limited to high and low shelves
  • No LDAC support

WHO THIS UNIT IS FOR:

  • People looking for a practical HiFi amplifier
  • People who want a feature rich desktop amplifier
  • People who want microphone support on their HiFi amplifier

WHO THIS UNIT ISN’T FOR:

  • People who want an amplifier with a smaller footprint
  • People who want more gaming oriented features
  • People who want a simple amplifier

SHORT REVIEW:

While not as focused as a gaming amplifier, the K7 is one of the most practical amplifiers I’ve ever tried. Mic support, an informative OLED screen and a powerful but clean sound on a sub $200 amplifier is something that was not in my bucket list of 2025, but I’m glad it exists. I really cannot think of one “con” about the K7 besides the fact that its “gaming” features are lackluster compared to its HiFi features. HIGHLY RECOMMENDED!

FULL REVIEW:



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We may be too late to explore the world and too young to explore the universe, but we live in a timeline where a desktop amplifier can have great sound quality, sufficient power to even power headphones, microphone support, a crap ton of other features including a dope LED screen all for potentially under $200.

Shilling aside, the K7 has been a seriously versatile device that has changed my perspective on just how practical yet high quality audio amplifiers can be. I’ve always attributed audio devices like these to be extra effort for little gains, at least for casual use. But I haven’t used a device as my main “source” of amplification as much as I did without feeling like I need to change my entire set-up just to get it to work properly.

So today, let’s talk about the K7 and all of its glory, but also what can be improved to potentially make the ultimate “gaming” desktop amplifier.

FOSI K7 SPECIFICATIONS:

Chipset - XMOS XU208 + AKM4493SEQ+ QCC 3031 + TPA6120
Maximum Sampling Rate:

  • USB: PCM 384kHz - 32bit/DSD256
  • Optical: PCM 24/192
  • Coaxial: PCM 24bit/192khz
  • Bluetooth: PCM 24 Bit / 48kHz

Headphone Impedance: 16 - 300 ohms

Input: Coaxial, Optical, USBC-C, Bluetooth, 3.5mm Microphone

Output: RCA, 3.5mm Single-Ended, 4.4mm Balanced

Bluetooth Version: 5.0

Bluetooth Connection Distance: Less than or equal to 13m

Bluetooth Transmission Audio Format: SBC, AAC, aptX, aptX HD, aptX LL

Input Voltage and Current: DC12V 2A

BUILD AND INTERFACE

The most “gaming” aspect about the K7 is the build and interface. Hell, a friend of mine even said it looked like a DJ booth and I don’t blame them. This rectangular, angled and chiseled look is distinctive to only Fosi with their somewhat industrial designs.

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The K7 is, by far, their most “unique” designed amp that I’ve tried as it leans closer to a more futuristic design, similar to what HiBy is doing. This is evident with the orange highlights being placed in a way that looks very eye-catching.

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However, the highlight is that OLED screen, which is something I never knew I wanted in an amplifier, but now I actively look for in my future purposes. It’s such a practical thing to see not only your current connections and decoding, but allow for the K7 to be as feature rich as it is. More on that later.

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As for the quality of the interface themselves, they feel alright. The knobs in particular are a little shaky and the interface buttons feel a little cheap. I would be fine with it if it wasn’t for the fact that the cheaper SK01 has more confident buttons than this. Not to worry, it does feel durable enough for a few years of aggressive volume changes without issue.

Features

The K7 is jam packed with features that overwhelmed me with just how much I can do with this. Let’s talk about them one by one.

Built-in EQ

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The first thing that you’ll probably play around with the K7 is the EQ. Yes, the K7 has built in EQ which can be toggled by pressing the TONE/MIC button. This brings up the bass and treble values that both go from +12 to -12.


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The way that the EQ was implemented here were low and high shelves with the low shelf having a more drastic change than the high shelf, as expected for ear safety. You can drastically change the bass profile without introducing boxiness and bloat as long as the headphones you’re EQing aren’t already bloated to begin with. The subtle treble boost can also add much needed sparkle or cut down energy pretty damn well. This is almost equivalent to adding an impedance adapter on certain IEMs. Ideally, you wouldn’t want to crank the values all the way up or down (especially on the bass), but it’s a nice way to see just how far your headphones can get equalized. This is a decent value and one that should be more than enough for basic adjustments that physical EQ knobs would do. Looks cooler than those, though!

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But what if you don’t want to do EQ but you also don’t want to reset the profile you have? Bypass mode! It’s a dedicated button that allows you to disable the EQ without needing to reset the values. Once you want to go back to your EQ profile, just press that bypass button again!

It would have been nice for more profiles to be added in order to just swap between profiles depending on the vibe/headphones you’re pairing the K7 with, but the bypass mode is nice in of itself.

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I should also note that the EQ only works on UAC 1.0 and not on UAC 2.0. I can’t confirm exactly why UAC 2.0 cannot support EQ (and the microphone as I’ll talk about soon) as UAC 1.0 seems to exist only for backwards compatibility and devices that only support UAC 1.0 like the Nintendo Switch, but as it stands, you’re limited to UAC 1.0 when enabling the EQ. Speaking of UAC;

UAC Button

One thing that has been present in many DACs, including dongles, is the option to switch from UAC 1.0 and 2.0. UAC 1.0, from what I’ve researched, is mostly used when pairing with devices like the Nintendo Switch, but also allows for microphone support in tandem with the audio output.

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I first came across this with the Simgot DEW4X with its occasionally working microphone support. The K7 makes the process very linear and easy to understand as all you need to do is press a single button and you’d be able to see on the OLED screen whether you’re in UAC 1.0 or UAC 2.0.

My only gripe is that, on top of the delay when switching modes which breaks the flow of listening, UAC 2.0 seems to have an odd delay when switching between tracks. I initially thought this was an app thing as I was using MusicBee on Windows, but this also happened in Spotify.

Thankfully, this is only present when switching between tracks and not the transition between tracks. It would have been a massive con for me if it did.

OLED Screen

I’ve talked about the features of the K7 that use the 1.5 inch OLED screen, but I want to talk about just how practical this thing is, especially if you’re a file junkie and love to know about the sample rate. On top of that, you can also see what connection mode you’re in so you know if the device is broken or you’re just on the wrong connection mode.

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My only gripe is that the sampling rate can only be seen if you’re in UAC 2.0 in USB mode. It’ll only show if you’re in PCM or DSD mode on UAC 1.0 with no information on whatever file you’re decoding. This isn’t really a dealbreaker, but one that I’m curious as to why it wasn’t included.

Regardless, that OLED screen is a standout as I haven’t experienced a desktop amp with such a feature.

Bluetooth

The bluetooth feature of the K7 is a rather basic Bluetooth 5.0 system that can only decode up to 24bit/48kHz with aptX. While it might seem lackluster, I’d say that it’s perfectly justifiable considering the focus of the device.

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LDAC would have been a nice addition, considering how great this sounds on wired, but it’s not a dealbreaker for me. aptX HD being capable of at most 576 kbit/s decoding is perfectly fine considering most of my streaming is done through Spotify as most of my playlists are there. However, I will acknowledge the purists who want LDAC and unfortunately, the K7 will not suit you.

Connection quality is pretty good, albeit occasionally stuttering on my PC during normal use. It could be an issue with my bluetooth dongle, but either way, it’s a generally stable connection.

The main thing I want to point out is the latency being surprisingly good. While watching movies or playing games, I didn’t think the bluetooth delay was long enough to affect my experience. The sound, most of the time, matches my inputs and what happens in front of the screen. This is thanks to the QC3031 Bluetooth chip allowing for a decent bluetooth listening experience.

Microphone Input

The one aspect that baffled me the most about the K7 was the microphone input. Normally, desktop amps in this category of the audio space lean towards either end of the quality-convenience spectrum. Either you get all the audiophile features or all the practical features.

The K7 combines both of that with the microphone input that seems to be a big part of the K7’s identity, gaming amplifier and all. It comes with a dedicated volume and mute knob that will show on the OLED screen its current volume level.

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The quality of the microphone will depend on the microphone that you pair it with. Pairing it with in-line or boom-style microphones is great as it provides enough power while minimizing distortion, audio bleed and interference. However, audio-bleed (audio from your headphones bleeding into the mic) is still dependent on the headsets that you’re using.

However, I wouldn’t recommend pairing this with a condenser microphone as it doesn’t really provide enough power to give the condenser microphones the proper amplification. Anyone who’s owned a 3.5mm condenser microphone should be aware of this.

This then brings me to the aspect of the microphone that I’m not that big of a fan of. First is the fact that it’s UAC 1.0 limited. While I understand that UAC 1.0 is necessary to allow for microphone support, it somewhat defeats the purpose of making the listening process linear when you have to switch between UAC 1.0 and UAC 2.0 if you want to use your microphone.

Another issue that I have that isn’t necessarily a fault of the K7 is that most external microphones and even gaming headphones nowadays use USB for their interface. While there are still a lot of gaming headphones that use TRRS and lapel mics that use 3.5mm make the perfect pairing with the K7, it would have been insane if Fosi had included a Type C Microphone input on top of the 3.5mm microphone input with this. This would have instantly made it a must-recc for literally every single person on this planet. This leaves another USB slot for your PC and makes the K7 a proper all-in-one device.

Lastly, the bluetooth input does not have microphone support. Not really a dealbreaker, but bummed those who have bluetooth headsets could make the K7 an easy way to minimize the cables to their PC.

Regardless, I’m not complaining about the fact that the K7 has a microphone input and I am so thankful that Fosi is closing the gap between practicality and audio quality with this. Speaking of audio quality;

SOUND


Output Specifications

3.5mm
Rated Power Output600mW + 600mW
SNR122dB (A-Weighting)
THD+N0.0005% (A-Weighting)
Dynamic Range121dB
Noise Floor_< 2.5uV (A-Weighting)
Frequency Response20hz - 20khz

4.4mm

Rated Power Output2100mW + 2100mW
SNR121dB
THD+N<0.0002%
Dynamic Range121dB
Noise Floor6.5uV
Frequency Response20hz - 20khz

Listening Experience

DISCLAIMER:

I would like to preface this by saying that most of my listening was done on USB UAC 1.0 and UAC 2.0 as well as Bluetooth. This is because I wanted to focus my testing specifically on how I personally use it. I never used the coaxial and the RCA function, but I will make an updated post on how this works.

The thing that bothered me about amplifiers was just how difficult it is to properly pinpoint the differences between each other as good amplifiers are meant to playback music through headphones with linearity and clarity. Colored amplifiers are for poorly made or tube amplifiers.

That being said, the K7 sounds clean as hell. While my perspective on how good desktop amplifiers can get changed since I got the SK02, I can’t deny that the K7 has a certain level of cleanliness that not even the SK02 has.

The best way I can describe how the K7 sounds compared to every other amplifier I’ve used is a really good piece of linen canvas. It’s a clean, flat and linear surface where once you begin to paint, all the colors come to life and blend perfectly when you want it to and stand out when it needs to.

The K7 is quite literally a blank canvas of an amplifier that, no matter what headphones or earphones you pair with it, you will get the best listening experience you’d have with those headphones. Straight up, it does what a good amplifier does.

The low end can be tight or punchy, depending on the track and headphones. The mids are consistently clean, nuanced and transparent on tracks and headphones that bring about that clarity and cleanliness. The treble is snappy, lively but smooth and polished on tracks that are equally smooth, but it doesn’t overly emphasize the sharpness on even poorly mixed tracks. Obviously, the headphones are 95% the sound in this equation, but even then the K7 somehow finds a way to make the headphones more enjoyable by not overemphasizing the bad aspects of the headphones more than cheaper or poorly implemented amplifiers.

This cleanliness also allows for your headphones to perform at its best when it comes to their individual technical ability and headphones with impeccable separation and layering will be perfectly played through the K7. I seriously could not find an aspect of the K7 where it sounded “lacking”.

Power Output


The highlight has to be the power, however. 600mW on 3.5mm and 2100mW on 4.4mm on high gain is literally the most power that I’ve ever had on an amplifier. Both the SK02 and DC03 maxed out at 1400mW and this goes even higher? I don’t even have a pair of headphones that can utilize 2100mW of power! That only means that you will never struggle with driving and pair of headphones here. The impressive part is how well it handles volume scaling for how powerful it is. I’ve had amplifiers in the past that were either too soft or too loud at low volumes and the K7 is not that. It’s not as fine as something like the SK02 where the differences in volume is so fine that most IEMs regardless of impedance and sensitivity will have a perfect volume spot, but it’s good enough.


Pairing

This makes the K7 essentially a universal pairing with basically any IEM/headphone that I’ve tried. Normally, I’d feel the need to highlight a specific pairing with an amplifier that I review, but the K7 is so versatile and uncolored that basically anything that you want to hear in its full glory and in its best clothing, you’d pair it with the K7. Besides the SK02, I can’t say the same for other amps I’ve tried.

Noise and Distortion

I didn’t find the K7 to distort even at higher volumes (at least to my hearing capability), however, it does have an occasionally audible noise floor for very sensitive IEMs. It’s not super audible, but having nothing playing in your IEMs makes the noise floor a little audible.

It’s a seriously good sounding amplifier with enough power for basically anything that doesn’t need a transformer to run.

COMPARISONS:


vs SK02

I’ve been talking about the Fosi SK02 as a main comparison for the longest time in the review, but how does it really compare?

Well, fundamentally, the K7 is what the SK02 would be if it was buffed 100 times and catered to a more practical market. However, I’m also aware that the SK02 is a completely different product category to the K7.

This is evident with the existence of the K5 Pro, but since I don’t have that, I have to compare these two.

And realistically, sound wise, the SK02 and the K7 both present music in such a linear yet lively way. It’s neither clinical nor colored and it emphasizes the best aspects of the IEM or headphone that you pair with the amplifier.

The main sound difference would come down to the difference in output and how the K7 edges the SK02 just a little bit more in cleanliness, particularly in the treble region.

With the obvious physical differences like the SK02 not having the OLED screen and only featuring a single knob on top of the countless features the K7 has, it’s clear that the jump in price is justified.

Regardless, the SK02 fulfills the budget-friendly audiophile better than the K7 and the K7 is a far more practical and powerful device for power users and “gamers”

CONCLUSION:

Every other amplifier and DAC have become irrelevant to me because of the K7. I said the same thing about the SK02 and the K7 did to the SK02 what it did to every other amplifier that I’ve owned.

The K7 is quite simply the ultimate desktop amp for a person like me who spends most of their time on the desk working or studying. Powerful, feature rich and practical are the best ways I can describe the K7.

However, that doesn’t mean the K7 is a perfect device. The small nitpicks with the knobs and buttons along with the occasional delays and maybe even the fact that despite being a “gaming” amplifier, it doesn’t really have much gaming features like what other dedicated gaming brands would offer. Lack of LDAC is also a shame, but one that is understandable with how feature rich it already is. But I would argue that the K7 is more catered to practical-minded audiophiles who might be into gaming as well.

But fundamentally, this is just a really good desktop amplifier. A bit tedious and cable-rich? Yes. But powerful, practical and versatile? Absolutely. That’s what makes the K7 stand out from every other amplifier I’ve tried

Thank you for reading my full review on the Fosi K7. As of the current moment, the K7 is on Kickstarter here: https://www.kickstarter.com/projects/fosiaudio/fosi-audio-k7-gaming-headphone-amp-dac
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L8890

New Head-Fier
Fosi Audio K7 Gaming DAC/Amp Review
Fosi Audio K7 Gaming DAC/Amp Review
1. Introduction
• Background
In late 2024, I had the privilege of receiving the soon-to-be-released flagship product from Fosi Audio—the K7 Gaming DAC/Amp. After just two weeks of use, it completely replaced my HyperX Cloud III wireless gaming headset, which had been my trusted audio companion for over a year, becoming my primary audio device. Designed specifically for gamers, the K7 maintains Fosi Audio's hallmark of exceptional sound quality while being deeply optimized for gaming scenarios. Whether it’s the precise capture of footsteps in FPS games or the immersive environmental soundscapes in action games, the K7's performance is nothing short of impressive.
• Market Position
Traditional gaming sound cards often rely on standard 3.5mm headphone and microphone jacks, aiming to accommodate the needs of most gaming headsets. Meanwhile, devices with a 4.4mm balanced output are usually found in the realm of Hi-Fi DAC/Amps, catering to users with higher demands for sound quality and driving power. The Fosi Audio K7 cleverly bridges the gap between these two categories. It retains high-quality sound performance while addressing the unique needs of gamers. Supporting high-fidelity audio output and optimized for convenient in-game voice communication, the K7 allows users to enjoy both Hi-Fi audio quality and gaming performance in a single device.
• Cross-Category Innovation
As a hybrid device targeting both gaming and Hi-Fi markets, the K7 offers unique advantages in sound quality, functionality, and gaming experience. In the following sections, I will provide a detailed evaluation of its features and real-world performance based on my hands-on testing, covering functionality, sound quality, and user experience.
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2. Official Specifications and Features
  • Input/Output Interfaces
    • Front Panel: 3.5mm microphone input, 3.5mm headphone output, and 4.4mm balanced headphone output.
    • Rear Panel: RCA output, Bluetooth antenna port, coaxial input, optical input, USB input, and 12V external power input.
  • Bluetooth Features
    • Supports Bluetooth 5.0.
    • Compatible with Bluetooth formats such as aptX HD, aptX, AAC, and SBC.
    • Sampling rate: 48kHz / 24-bit.
  • EQ Adjustment
    • Frequency split point: 1000Hz for high/low-frequency adjustments.
    • Adjustable range: ±6dB for high frequencies, ±12dB for low frequencies.
  • Gain Function
    • High/low gain modes, accommodating headphones with varying impedance.
  • BYPASS Function
    • A dedicated button toggles the BYPASS mode.
    • When BYPASS is enabled, the device bypasses internal high/low-frequency adjustments, outputting raw audio signals.
    • When disabled, the device resumes and applies the previously set EQ adjustments.
  • 4.4mm Balanced Headphone Output Performance (UAC)
    • Rated Power: L+R ≥ 2100mW + 2100mW (32Ω load, THD+N < 1%).
    • Signal-to-Noise Ratio (SNR): 121dB (A-weighted).
    • Total Harmonic Distortion (THD+N): 0.0002% (A-weighted).
    • Dynamic Range: 121dB.
    • Noise Floor: < 6.5μV (A-weighted).
    • Frequency Response: 20Hz-20kHz (±0.2dB).
  • 3.5mm Headphone Output Performance (UAC)
    • Rated Power: L+R ≥ 600mW + 600mW (32Ω load, THD+N < 1%).
    • Signal-to-Noise Ratio (SNR): 122dB (A-weighted).
    • Total Harmonic Distortion (THD+N): 0.0005% (A-weighted).
    • Dynamic Range: 121dB.
    • Noise Floor: < 2.5μV (A-weighted).
    • Frequency Response: 20Hz-20kHz (±0.2dB).
  • RCA Line Output Performance (UAC)
    • Output Voltage: ≥ 2Vrms.
    • Signal-to-Noise Ratio (SNR): 121dB (A-weighted).
    • Total Harmonic Distortion (THD+N): 0.0005% (A-weighted).
    • Dynamic Range: 121dB.
    • Noise Floor: < 3μV (A-weighted).
    • Frequency Response: 20Hz-20kHz (±0.2dB).

3. Design and User Experience
  • Materials and Craftsmanship
    • Full aluminum alloy body with CNC unibody construction.
    • Surface treated with sandblasting for a refined finish.
  • Design Highlights
    • Separate volume knob and microphone volume knob for precise control.
    • Equipped with a 1.5-inch LCD display.
  • Portability and Practicality
    • Dimensions comparable to a smartphone, slightly shorter in height than the SK02.
  • Aesthetic Design
    • Maintains Fosi Audio's signature orange-and-black color scheme.
    • A futuristic design with a subtle touch of tech-inspired aesthetics.

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Comparison with the SK02
  • Operational Experience
    The K7 inherits the knob design of the SK02 while adding an additional knob, resulting in a more versatile functional layout. The left knob is used for volume adjustment and gain control, while the right knob focuses on microphone volume and EQ adjustments. Both knobs are similar in size and tactile feel to those on the SK02, offering a consistent operational experience.
  • Enhanced Interface
    Compared to the SK02, the K7 takes the user interface a step further by integrating a 1.5-inch LCD display in the center of the knobs. Featuring a black background with orange text, the display provides a clear and intuitive view of the current status. Below the screen are five functional buttons corresponding to UAC mode, input mode, output mode, BYPASS function, and high/low-frequency adjustment toggles. The control logic is simple and intuitive, making it easy to master with minimal practice.
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  • Portability and Functionality
    It’s worth noting that the K7 requires an external power supply. Although its compact size remains an advantage, its portability is slightly reduced compared to the SK02. However, the K7 makes significant advancements in functionality, making it more suitable for desktop audio setups and multi-scenario usage.

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Minor Design Flaws
  • Microphone Limitation
    The microphone can only be used in UAC1.0 mode, which may limit its functionality in certain scenarios.
  • Port Spacing Issue
    The spacing between the microphone jack and the 3.5mm headphone jack is somewhat tight. This could pose a challenge when attempting to simultaneously connect devices with larger plugs.

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• Inconsistent Volume Adjustment
The volume values change irregularly during adjustment, such as 30, 32, 33, 36, 38. This inconsistency may not be ideal for users who prefer precise and uniform control, especially those sensitive to such details.


4. Sound Performance (Without EQ Adjustment)
I. Overall Sound Signature

• Tuning: Neutral and balanced, with no noticeable coloration.
II. Frequency Response
1. Low Frequencies
o Excellent depth and extension with moderate quantity.
o Superb control, delivering clean bass without a boomy or overwhelming sensation.
2. Mid Frequencies
o Vocals are full-bodied and positioned appropriately.
o Instruments exhibit clear texture and well-defined layering.
3. High Frequencies
o Good extension with a natural and delicate presentation.
o Rich in detail without sounding harsh or fatiguing.
III. Soundstage and Imaging
The K7 offers a spacious soundstage with a balanced and layered distribution. Its horizontal soundstage feels expansive, while the depth is moderate, effectively conveying changes in front-to-back distance.
IV. Detail Retrieval
The K7 excels in resolution, reproducing fine details in music and gaming audio with precision. Even in complex audio scenarios, it maintains clarity.
• Noise Floor: Exceptionally clean background with no audible noise.
• Separation: Outstanding layer separation, with smooth and natural transitions between frequency ranges.
• Distortion: The low-distortion design ensures highly accurate sound reproduction, even during dynamic shifts or in detail-critical moments, resulting in a natural and authentic listening experience.
V. Comparison with Fosi Audio’s SK02
The K7’s sound performance is highly consistent with that of the SK02. Both share a balanced and neutral tuning, demonstrating excellent compatibility with high-impedance, low-sensitivity headphones. Despite using different chipsets, the K7 has a slightly warmer tonality compared to the SK02, but the difference is minimal. Without a direct side-by-side comparison, the variation is almost imperceptible. For most users, the sound performance of the K7 and SK02 is remarkably similar. Both cater well to users seeking accurate reproduction and balanced sound. If you already own the SK02, upgrading to the K7 purely for sound quality may not be a necessary decision.

Tested Headphones: Sennheiser HD660S, Sony MDR-V6, Audio-Technica R70X



5. Sound Performance in Competitive Gaming
I. Sound Performance in Competitive Gaming
HyperX Cloud III
• Sound Signature

o Tuning: Close to the Harman curve, offering ample low frequencies with good depth and fast transient response, resulting in dynamic bass. However, it can feel slightly overwhelming at times.
o Mids: Clear vocals with a balanced positioning, though occasional sibilance occurs, especially in scenes with rich high-frequency details.
o Spatial Presentation: Excellent sense of space, with clear localization and distance cues, making it suitable for basic FPS gaming needs.
o Drawbacks: Higher distortion, less defined instrument separation, and somewhat lacking detail and layering.
• FPS Gaming Performance (CS2)
o Default "Natural" EQ setting delivers bright and impactful gunshots, though they can feel overly pronounced. Footstep directionality is good, enabling clear identification of enemy positions and distances. However, the overall sound lacks naturalness—footsteps feel slightly hollow, and jump-landing sounds can be harsh. High-frequency weapon-switching effects, like "knife sounds," are particularly noticeable. Adjusting the headphone EQ by reducing 8kHz by approximately -4.5dB significantly improves these issues, reducing harshness and sibilance.
• FPS Gaming Performance (Valorant)
o Footstep localization remains vague and lacks fullness, with insufficient layering. Enabling in-game HRTF surround sound greatly enhances spatial perception and separation, improving footstep clarity and directional accuracy. However, distant subtle sounds can become overly amplified, complicating distance estimation.

K7 Paired with HiFi Headphones
• Sennheiser HD660S

o Default sound is slightly heavy, with muffled footsteps and gunshots, and average directional and distance performance. Adjusting the K7 EQ (+6dB high frequencies, -1dB low frequencies) improves footstep clarity and widens the soundstage. Overall, it performs better than the HyperX Cloud III, though its footstep clarity still slightly lags behind.
• Audio-Technica R70X
o Natural sound with excellent positional and distance accuracy. Gunshots and footsteps retain some of the R70X’s signature "warm blur." Even without EQ adjustments, the R70X outperforms the HyperX Cloud III. Changing the in-game EQ from "Natural" to "Crisp" or adjusting the K7 EQ (+1dB high frequencies, 0dB low frequencies) further enhances footstep clarity.
• Valorant Performance
o Using the same EQ settings as for CS2, the footstep clarity, directionality, and distance perception are highly accurate. Skill sound effects and footsteps are well-separated. In complex scenes, enemy positions can be quickly discerned. Disabling the HRTF surround sound feature is recommended to avoid excessive sound clutter near the ears, which can affect distance and spatial perception.

II. Microphone Comparison
HyperX Cloud III

• Performance
o Clear and bright voice capture with excellent noise reduction, effectively eliminating environmental noise (e.g., fan noise, keyboard clicks). Overall, it ranks highly among gaming headsets.
K7 with Microphones
• BOYA M100
o Slightly warm vocal tone with a hint of smearing. The sound feels more distant but remains clear overall, with good noise reduction. While slightly inferior to the HyperX Cloud III, it is still acceptable.
• Microphone integrated into wired earphones
o Average voice capture quality with slightly muffled vocals. However, it is still adequate for voice communication and gaming.

III. Summary
• Sound and Spatial Performance

In popular FPS games, the K7 paired with HiFi headphones outshines gaming headsets in both sound quality and spatial localization. Comfort during extended gaming sessions is another significant advantage. Recently, I spent 12 hours straight playing Immortals of Aveum with the R70X, an experience that would be unbearable with the HyperX Cloud III due to its 330g weight compared to the R70X’s 210g.
• Wireless vs. Wired
Despite the K7's superior performance with HiFi headphones, there is one area where it cannot compete: the freedom of wireless. Modern wireless gaming headsets, with 2.4G receivers, have achieved impressively low latency. Although a slight delay is still perceptible compared to wired setups, it is negligible in gaming scenarios. The convenience of wireless freedom—grabbing a snack, getting a drink, or even visiting the bathroom without removing the headset—is hard to overlook.

Ultimately, the choice comes down to priorities: precise sound performance or flexible, convenient usage.


6. Compatibility and Bluetooth
• Compatible Devices

o Supports PC, PS5, Switch, and other devices.
o No driver download is required, making it very convenient to connect to PCs or other devices.

• Bluetooth Connectivity
o Based on the chipset, it is presumed to support Bluetooth 5.0.
o During FPS gaming, there is a slight delay between gunfire sounds and game visuals, but this is negligible for watching movies or TV shows.
o Bluetooth connection is stable, with no occurrences of disconnections or audio-video desynchronization.
o The Bluetooth functionality is particularly convenient when occasionally connecting the K7 to a smartphone or tablet.


7. Target Audience
• Who Should Consider the K7
For users who want to balance competitive gaming and high-quality audio—especially those who own hard-to-drive over-ear headphones—the K7 is an excellent value-for-money choice. It offers a near-complete solution through a single device. However, for users who already own the SK02 or primarily use easy-to-drive in-ear monitors, the K7 may not be as compelling. That said, gamers who specifically require external microphone functionality might find the K7 worth considering.
• Crowdfunding Launch on Makuake
Notably, Fosi Audio launched the K7 project on the Japanese crowdfunding platform Makuake on January 16, 2025. For those interested, the Makuake page provides more detailed product information and support options. If the K7 has caught your attention, be sure to visit the following link to learn more and support the project:
👉 https://www.makuake.com/project/fosik7/


8. Conclusion
• The Fosi Audio K7 strikes a perfect balance between sound quality, versatile functionality, and powerful driving capability, making it an excellent choice for both gamers and HiFi enthusiasts. It continues Fosi Audio's signature neutral tuning style while significantly improving functionality and user experience. With robust support for high-impedance headphones, it easily adapts to various usage scenarios.
• The K7's upgrades over the SK02 are primarily in its functional layout and adaptability, while the differences in sound performance are minimal. If you’re seeking better sound quality, richer functionality, and stronger driving power for premium headphones, the K7 offers exceptional value. However, if you already own the SK02 or prioritize portability and wireless convenience, a wireless gaming headset might be a better fit.
• Ultimately, the K7 is a device that successfully balances sound quality and functionality, catering to users who want to enjoy both gaming and music. The final decision depends on your specific use cases and personal preferences.

Here is the buy link for this product👉https://www.kickstarter.com/projects/fosiaudio/fosi-audio-k7-gaming-headphone-amp-dac?ref=itsgreq

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Kindlefirehditaly

New Head-Fier
Fosi Audio K7 Gaming DAC/AMP: Are We Sure?
Pros: Pretty big boy
AK Sound Signature—Touch of Warmth
Extra Powerful—62 volume steps
Improved stage and details
Mature & polished sound
L & H Gain switch for easy IEMS
Treble & Bass Adjustments
No APP direct & easy controls
Dedicated power supply
OLED display
Total Independent volume (on OSX)
Cons: More Hi-Fi than Gaming (i’m more audiophile than gamer so this is a pro.)
No PEQ
No dedicated Software (i’m fine with it)
No fancy RGB lights (not really a cons)

Fosi Audio K7 Gaming DAC/AMP Review: Are We Sure?​


Fosi Audio K7 on Grass



Disclaimer:​

Good morning, readers! Today we are here with a brand new product from Fosi Audio, a DAC/AMP with very interesting specifications, the Fosi Audio K7. I just reviewed the Creative SoundBlaster G8 so the comparison becomes very interesting indeed. Products like the Fosi Audio K7 can be appreciated even more because they fully express the efforts of a smaller brand to compete with the giants. We are not on par in terms of extra features but everything else is actually superior in quality. Calling this product suitable for gaming is wrong because the audio quality of the K7 is far beyond. Despite the lack of “surround” technologies, the K7 creates an immense stage.

The review, as always, will be completely unbiased, uninfluenced, and free of affiliate links.

I would like to remind you that I am just a person who enjoys trying out new items and listening to a lot of music; I am not an expert.

My opinions are obviously subjective.

Tech Specs:​

  • AKM AK4493S DAC: High-resolution audio with low distortion, enhancing in-game sound effects and delivering studio-grade music quality.
  • XMOS XU208 USB Controller: High-speed digital audio processing for synchronized game audio and visuals, plus clean signal transmission for music.
  • OPA1612 Op-Amp: Improves positional audio accuracy in games and provides low-distortion sound with rich detail for music.
  • TPA6120 Headphone Amplifier: Powerful headphone-driving capability for both low- and high-impedance headphones, ensuring impactful sound and pure audio quality.
  • Qualcomm QCC3031 Bluetooth Chip: Supports aptX LL low-latency for gaming and aptX HD lossless for near-wired HiFi wireless listening.
4.4mm Balanced Headphone Output:

  • Rated Power Output: L+R ≥ 2100mW + 2100mW (32Ω/THD+N<1%)
  • SNR: 121dB
  • THD+N: 0.0002%
  • Dynamic Range: 121dB
  • Noise Floor: ≤ 6.5μV
  • Frequency Response: 20Hz-20kHz (±0.2dB)
3.5mm Single-Ended Headphone Output:

  • Rated Power Output: L+R ≥ 600mW + 600mW (32Ω/THD+N<1%)
  • SNR: 122dB
  • THD+N: 0.0005%
  • Dynamic Range: 121dB
  • Noise Floor: ≤ 2.5μV
  • Frequency Response: 20Hz-20kHz (±0.2dB)
RCA Output:

  • Output Level: ≥ 2Vrms
  • SNR: 121dB
  • THD+N: 0.0005%
  • Dynamic Range: 121dB
  • Noise Floor: ≤ 3μV
  • Frequency Response: 20Hz-20kHz (±0.2dB)
I hope this list is helpful! Please let me know if you need any further clarification or information.

System Requirements:​

I have not found specific information but what I can tell you is that the product works without problems with OSX but that it has a totally independent volume not controllable by Mac. I think it can be solved with a firmware update to be done probably using a Windows PC where the drivers are installed. In general it works with any device because it does not need to be powered.

Packaging:​

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Fosi Audio K7

The Fosi Audio K7 packaging is very simple, all black but the product is well protected. Inside it is everything you need to put it to work right away.

  • Fosi Audio K7
  • BT antenna
  • Power Supply 12V 2A
  • 1 Cable Type C to Type C/USB
  • Mic + Aux splitter
  • User Manual
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Much more intelligently than Creative, Fosi has put a cable with a built-in USB adapter (it has been using it for a long time) and it is the most wonderful accessory you can find. The Fosi Audio K7 has its own power supply of 12V 2A. We also find a BT antenna.

There are no other cables but what is there allows anyone to use it immediately.

Build Quality/First Impressions:​

Fosi Audio K7 Front
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Since I also own the old Fosi Audio K5 Pro, I wonder if it’s really the same company. The leap in quality is so huge that I can hardly believe it’s still them. The K5 Pro compared to the K7 is a toy. Even taking the more recent Fosi SK02 as an example, you can perceive a further evolution in the care of their products. You can tell that it’s a company that listens to its customers and that carries out surveys regarding the features they want.


The Fosi Audio K7 is a high quality product, all in CNC machined metal, I don’t think there is anything plastic. The weight of the product itself is an indication of the amount of metal that has been used. Compared to the Creative G8 where even the knobs are plastic. The attention to detail can be seen in the precision that the buttons have in their seats, how precisely the volume knobs rotate and the rubber feet underneath that bear the Fosi branding (perhaps even excessive as a thing). But honestly, it’s nice to see a brand put so much effort into it, especially knowing where they started from.

On the upper part we find in the middle a small but use OLED display, two knobs the first for the volume and the second for the adjustments.

Below we have 5 buttons for the management of the Fosi Audio K7:

Fosi Audio K7 on Grass

  • UAC Mode
  • Input
  • Output
  • Bypass/Direct
  • Tone/mic adjustments
On the front we have microphone input, 3.5mm output and 4.4mm output. The presence of the balanced output makes me extremely happy.

On the back the comparison with the Creative Sound Blaster G8 is not on par. The Fosi Audio K7 has Bluetooth though. For the rest we have Coaxial, Optical and RCA outputs

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Oled Display

Special Features:​

Fosi Audio K7 vs K5 Pro vs Sk02 vs Creative G8

Let’s say that the features are definitely basic if compared to the Creative but for my non-gaming use, the ability to adjust the highs and lows is already very interesting. The thing I like is that you don’t need software but everything is manageable with the buttons and knobs.

Even the microphone can only be adjusted in its volume. Compared to the Creative SoundBlaster G8, the gaming features for modern games are limited. But if you use it at an audiophile level or for some old-school games or films, the story is completely different.

Sound Signature & EQ:​

Fosi Audio K7

The AKM AK4493S combined with the TPA6120 does a perfect job; in fact, right away it seemed to me that the stage compared to other models tested was particularly more accurate. The sound is basically very detailed and analytical with a warm note. Everything sounds extremely coherent and if there was a need for more brightness or anything else, you just need to correct the tones. I personally really like it in direct mode and I think it will become my reference DAC/amp for the tests from now on.

Unfortunately, there is no real full equalizer or presets you can use.

Power:​

2 Power Beast

Power is more or less comparable to the Creative SoundBlaster G8. I don’t know how it’s possible in reality but in terms of power, the Creative is more impressive, which, from a simple USB brings out capacities far superior to many of the competition. The Fosi Audio K7 has its own separate power supply so there is absolutely no lack of current. I simply believe the volume control is more precise and therefore does not give you “slaps” of volume like the other. So I believe it is only a matter of acoustic perception but in both, it is difficult to reach the maximum volume. In my case, the maximum I have tried is the EPZ x Tipsy Starn One with 64 OHM of impedance and at most you can reach 30 of volume out of 62. Regardless of what is connected to it, it is powered and driven perfectly.

Considerations after a month of use:​

Fosi Audio K7 Dac/AMP

In the new setup that I will do in a few months this product will have a key role on the desk. In the future it will become a point of reference for my future reviews, its sound and the possibility of controlling the tones quickly and quickly allows you to test the IEMs and headphones that I will have the opportunity to test. The sound, even if you should not notice big differences with other dac / amp, has a care and precision that I had never heard on the others. The totally silent background even with very sensitive IEMs like the Simgot EA100 Fermat make it suitable for any user. Compared to the Creative, the gaming DNA takes a back seat, this product is in all respects first and foremost a high-level HI-FI product. You can perceive the care and research that they are employing in improving their products. The definition that the Fosi Audio K7 brings out adds points to the soundstage.

The only downside might be the audio jacks on the front. This requires more desk space than is necessary on the front.

Fast Comparison:​

Looking at the past of Fosi Audio and the present of other brands, the comparisons become interesting.

vs Fosi Audio K5 Pro

Fosi Audio K7 & K5 Pro

I seriously have a hard time believing it’s the same company. The K5 Pro is a product that borrows a standard size chassis with minimal customization. You’ve probably seen a thousand amplifiers with the same chassis on AliExpress. A product that has a totally different quality that can’t even be compared. In terms of input and output, it can still be improved, but in terms of design, functionality, and build quality, it has made giant steps.

I’m not telling you about the sound because the K7 sounds 1000 times better.

vs Fosi Audio SK02

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A more recent product from Fosi but that still, even if perhaps a year old, makes it clear how the company is growing and in which direction. I find the SK01 brighter but not for this reason: it is more detailed and suitable for critical and analytical listening. In terms of construction quality, you can perceive a connection with the two products. In terms of sound, the K7 is a few steps above and is also much more powerful.

vs Creative SoundBlaster G8

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A fusion or joint venture between the two brands would create the definitive product for gamers and audiophiles. It will probably never happen but if the Creative features were to be merged with the Fosi Audio build quality, it would produce a definitive product for most users. Undoubtedly the versatility of the inputs and outputs is superior on the Creative, even the app support and the features designed for gamers or streamers are very advanced. If all this is not what you need, the Fosi Audio is really well made. I have no particular needs for gaming so I probably don’t see the real limitations that a gamer might experience.

Conclusions:​

In the case of minimal desks, I think a product like the Creative Soundblaster G8 could be very appealing. I am not a person who can identify with a desk with a minimal setup but surely in the near future I will have to drastically reduce the complexity of the setup I currently use. The thing I liked the most is the possibility of maintaining a single sound card for both my PCs and also sharing the two Pebble X speakers via wired connection. Before, I used them via USB only with one of the two and the other had to make do with the BT connection. The features with the DSP activated are multiple but I am more of a purist in that sense. Usually my favorite mode is the direct mode, where there are no colorations of the sound. Great that they finally managed to bring an update of the Creative APP on OSX but there is still a long way to go for it to be on par with the Windows one. As for gaming, the features present are more designed for streamers or creators.

In my opinion the Fosi Audio K7 has a sound that is anything but gaming but very Hi-Fi, I think one of the most complete and full I have heard so far. Are we sure it is a gaming DAC?

More information is here:​

jreqtech

New Head-Fier
A Gamer's Review of the Fosi K7 Gaming HiFi DAC/Amplifier
Pros: - Powerful and musically impressive
- Great build quality
- Wide soundstage, excellent holographic imaging, definitely immersive
- The built-in tone adjustment for treble and bass is a nice feature
- Loads of input and output options
- Affordable price for the features it brings to the table
Cons: - Despite being advertised as for “gaming”, there is a lack of gaming-specific features.
- There’s a noticeable amount of delay when using Bluetooth for gaming
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Disclaimer
Please note that I am not an audiophile, and this review does not delve into the technical aspects of the DAC/Amp. My impressions are based on my personal preferences, and others may have different experiences with this product. I also have a very limited experience with audio products so please take this review with a grain of salt.

The FOSI K7 was lent to me as part of a review tour.

Price: 155 USD (Kickstarter) / USD (Retail)
Link: https://fosiaudio.com/pages/fosi-audio-k7-dac-amp

Part 1: General Product Details

Package Inclusions:

  • The K7 DAC/Amp
  • DC 12v power supply
  • USB-A/C to USB-C cable
  • Bluetooth antenna
  • 3.5 headphone splitter
  • User manual
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General Specifications
  • Input: Coaxial, Optical, USB-C,Bluetooth,3.5mm Microphone
  • Output: RCA, 3.5mm Single-Ended,4.4mm Balanced
  • Bluetooth Version: 5.0
  • Bluetooth Transmission Audio Format: SBC, AAC, aptX, aptX HD, aptX LL
  • Chipset: XMOS XU208+AKM4493SEQ+QCC 3031+TPA6120
  • Headphone lmpedance: 16-300Ω
  • Input Voltage and Current: DC 12V 2A
Audio Parameters
  • 3.5mm Headphone Output
    • Rated Power Output: L+ R≥600mW+600mW (32Ω/THD+N<1%)
    • SNR: 122dB
    • THD+N: 0.0005%
    • Dynamic Range: 121dB
    • Noise Floor: ≤2.5μV
    • Frequency Response: 20Hz-20kHz (±0.1dB)
  • 4.4mm Headphone Output
    • Rated Power Output: L+R≥2100mW+2100mW (32Ω/THD+N<1%)
    • SNR: 121dB
    • THD+N: <0.0002%
    • Dynamic Range: 121dB
    • Noise Floor: ≤ 6.5μV
    • Frequency Response: 20Hz-20kHz (±0.1dB)
  • RCA
    • Rated Power Output: ≥2Vrms
    • SNR: 20Hz-20kHz (±0.1dB)
    • THD+N: 0.0005%
    • Dynamic Range: 121dB
    • Noise Floor: ≤3μV
    • Frequency Response: 20Hz-20kHz (±0.1dB)
The DAC/Amplifier
  • The body of the K7 is made up of cnc-ed aluminum, while the knobs and buttons are made of plastic. The knobs have tactile bumps per step and have around 20 steps each. The knobs are also clickable and has a tactile bump and an audible metallic click when you do.
    • On the front of the K7 are:
    • 3.5mm microphone input
    • 3.5mm headphone output and
    • 4.4mm balanced headphone output
    • On the rear of the K7 are:
    • DC 12V power
    • USB-C input
    • Optical input
    • Coaxial input
    • Bluetooth antenna (input)
    • RCA output
  • On the top are two 3.5cm stepped knobs and a small 1-inch LCD that shows information on currently used settings and connectivity.
  • The left knob controls volume when turned, and toggles gain level when pressed. The right knob controls input mic volume, and tone adustment for treble and bass when turned, and toggles mic mute when pressed.
    • Below the knobs and LCD are 5 buttons:
    • On-Off/UAC: turns the K7 on and off. If the K7 is on, this button toggles between UAC1 and UAC2
    • Input: toggles between the possible inputs
    • Output: toggles between RCA and headphones (either 3.5mm or 4.4mm - NOTE that it is NOT recommended to use 3.5mm and 4.4mm at the same time)
    • Bypass: overrides the bass and treble tone adjustments if you changed them. Use this to hear the natural sound of the K7
    • Tone/Mic: Toggles between bass and treble for tone adjustment, and can also control microphone volume if on UAC1
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Part 2: Subjective review

Setup #1 - PC Gaming

  • Source: PC (thru USB C to A)
  • Headphones: Philipa SHP9500
  • Games: Overwatch 2, Marvel Rivals, Subnautica
Setup #2 - Mobile Gaming
  • Source: Xiaomi Pad 5 (thru Bluetooth 5.0)
  • Headphones: Philips SHP9500
  • Games: Wild Rift, AFK Journey, CoD: Mobile, Wuthering Waves
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Test Notes
  • Due to a recent ear infection I am opting to use headphones for this review.
  • I will be using my iFi nano iDSD LE for comparing, as it’s the only desktop DAC/Amp that I own.
  • As much as possible I will be using the BYPASS output as to only hear the natural sound of the K7.
General Usage Impressions
  • The K7 heats up quite a bit, but with the power it’s about to output I think it’s normal, especially since it has an aluminum case.
  • As a gaming DAC/Amp, the feature that I expected to be there isn’t. It’s called “Chatmix” (like the one on the Steelseries Arctis 5) or GameVoice (like the one on the Soundblaster G8)
  • There’s definitely a splitsecond delay when using the Fosi K7 on Bluetooth mode. This is very apparent when pulling the trigger in CoDM and the explosion comes in a little late so I can’t recommend using this on Bluetooth mode.
  • As mentioned, the soundstage and holographic imaging of the K7 is excellent! Combined with the easy tone-adjustment of changing the bass, footsteps and in-game skills used in Overwatch 2 and Marvel Rivals was much more easier to hear coming. As a support main in both games, it’s always pesky to know when a Sombra or Spider-man is about to jump you.
  • Subnautica is another atmospheric game where you play as a stranded astronaut on another planet, forced to scavenge for your survival mostly underwater. It gets a little too real when you hear the water behind you suddenly bubbling.
  • All in all, non-Bluetooth gaming with the K7 is a treat and can give you an advantage if paired with the right headphones, people might even accuse you of using wallhacks!
Sound Impressions
  • Right off the bat, the Fosi K7 sounds strong, orchestral music sound fuller. Musical details and and clarity is excellent.
  • The details are clear and holographic, it’s definitely immersive.
  • Despite my headphones already being open back and therefore offers some good soundstage, the K7 enhanced that a bit more, and the sound felt wider in comparison to what I already hear from my ifi DAC.

Nitpicks
  • I have a keyboard with a knob that I use for volume control and mute/unmute. The K7 at times ignored any changes to the volume as well as muting/unmuting. I installed the provided driver here (link provided to us by Ryan of the Fosi team), but after a while it occurred again.
  • The K7 has a 3.5mm microphone input on the front panel. I wish the microphone input was on the back instead, as it’s cleaner.
  • The Bluetooth functionality of the K7 is for receiving audio (connect your phone or DAP to it), not transmitting audio (connecting to bluetooth headphones/in-ears). This would have been nicer especially if you have a wireless PCVR setup.
  • The 3.5mm microphone input is in the front. Would have been better to have it at the back for less cable clutter in the middle of the table. A USB or XLR input for the microphone would have been nice as well but maybe that’s asking for too much?
Other Notes
  • Maximum volume stops at 62. Sounds like a very arbritrary number right? They gave us the following explanation:
    Our product manager said that the maximum volume is 62%:
    1. Limited by the amplification level of the main control chip;
    2. Based on point 1, if the volume level is designed too fine, the number of rotations will increase.
  • The K7 is another device you have to manually turn on after you turn on your PC or console. It won’t turn on automatically since it uses external power.
  • I was confused what the UAC 1 and 2 were for at first but here’s the gist: UAC1 (USB Audio Class 1) supports up to 24-bit/96kHz audio with limited bandwidth and broader compatibility, while UAC2 (USB Audio Class 2) will disable microphone input in exchange for higher resolution, lower latency, and better synchronization. UAC 1 is present on the K7 because some consoles like the PS5 don’t support UAC2 yet, which makes UAC1 essential for GAMING DACs.
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Final Thoughts
The Fosi K7 is a functionally versatile but powerful DAC/amp, that punches above its price point. It’s a highly capable HiFi device with a wide soundstage, excellent holographic immaging, and immersive sound. And while it falls short of expectations with regards to gaming features, it’s no big deal as the Fosi K7, even if not marketed for gaming, will still be an excellent choice, especially with the discounted kickstarter price, making it a solid option for audiophiles and gamers looking for a budget-friendly HiFi experience.

I’m definitely looking forward to the next product Fosi makes, hopefully it’s going to have more gamer-centric features! Oh and next time, maybe some RGB for the 10% FPS boost? /s 😂

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GREQ

Headphoneus Supremus
If you are not paying attention, pay attention.
Pros: Utility focused
High build quality
Largely intuitive design and interface
Pricing is very fair
Balanced output with relatively high power in it's class
Black background*
Cons: *Very light humming was detected with one HYPER-sensitive IEM - likely won't be a problem for 99.9% of headphones/IEMs.
Bluetooth delay was noticeable while gaming - could be BT adapter dependent
Foss Audio K7 – Gaming DAC Amp

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For the passive consumers:



Disclaimer & Unboxing:

Fosi Audio
sent me another toy to play with, in exchange for my opinions.
The K7 ‘Gaming DAC Amp’.

It has been designed from the ground up to be the ultimate upgrade from the Fosi Audio K5.
Let’s see if it lives up to it’s promise.

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Build & Design

The entire shape and design isn’t just a departure from the old K5, but an almost total rethinking of what it means to design a desktop audio interface.
To get right to the point, it is a very human design.

Just think about it.
When you reach out to change the volume on a forwards facing knob, you’re limited to use your thumb and one or two fingers in an almost awkward, unnatural twisting motion.
When the controls are on the top of the device, this allows you to take control with almost all your digits in a very natural and comfortable position that isn’t far from their natural resting position on the keyboard.

Of course, Fosi Audio isn’t the first to do this, but it’s great to see more adoption.
The K7 therefore, has two, extra large, ribbed, black knobs that you can easily command with your sweaty gamer paws.

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The entire body, knobs and buttons are CNC milled aluminium alloy and it has some nice heft to it, which makes it easier to plug in your headphones without shifting the entire device backwards, and the top plate and all controls are angled towards the user.

Overall I think it looks great. While it might be too much of a departure for traditional audio enthusiasts, and might look to ‘gamer’, it is backed up with a rock solid build.
On the front of the device is 1 microphone input and 2 headphone outputs, 3.5mm and 4.4mm balanced.

On the rear is an almost full assortment of inputs including USB, coaxial, optical and Bluetooth which also supports the lossless aptX codec.
Also is an RCA out so you can use the K7 as a pure DAC for other devices.
And I do mean a pure DAC. When RCA-out mode is enabled, the headphone output stage is disabled and completely bypassed.

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Also on top of the K7 are 5 control buttons and the all-important Fosi-Audio-orange-themed LCD display.
To be clear, unlike full analogue amplifiers, the K7 is so full of features and controls that you absolutely do need to learn how to use it, and use the screen to use it.
There are a few controls you can learn to use blind, with some muscle memory, but others are not so simple.

Controls
Knobs

• Left knob twist - Volume control
• Left knob press - Toggle High/Low Gain
• Right knob twist - Treble/Bass/Mic volume
• Right knob press - Toggle Microphone Mute

Buttons - From left to right:
• On/off UAC – Short press to turn on, long press to turn off.
- When it’s on, short press switches between UAC1 and UAC2 modes.
- UAC2 mode is more for higher-end audiophoolery but the microphone input is disabled.
- UAC1 mode enables the microphone and microphone volume control.
• Input – simply cycles through all inputs.
• Output – simply toggles between headphone or RCA out.
• Bypass – more audiophoolery here; this mode bypasses the tone controls
• Tone/Mic – In UAC1 mode, this cycles between Bass, Treble and Microphone volume.
- In UAC2 mode, it simply toggles between Bass and Treble volume.

Out of all the controls, I think the first button might be the most important to learn quickly.
Finally after around 2 or 3 weeks I’m finally remembering the short press for on and long press for off, and of course the short press when on to toggle UAC modes.

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Using it daily & The Sound

I’ve been using the K7 as my daily driver since it arrived on my doorstep and I’m somewhat enamoured with it.
Previously I would alternate between the NFB11.28 and the SK01/SK02 combo, both equipped with ESS DAC chips, depending on what headphones I was using and how much raw power I needed.

The K7, with it’s AKM chip honestly doesn’t sound so different to my ears. Maybe there are people who can hear the subtle differences between DACs, but it’s usually lost on me.
I can however report that the K7 performs with much of the same authority and musicality I experience with the NFB11.28, which is an improvement over the SK02.

I still had to either switch to the audio-gd or K7’s RCA out to the SK01 if I wanted to use some of my headphones with a 6.3mm plug, but since these are marketed towards desktop gamers, I assume this won’t be a common problem.
I was also impressed with the high volume capability of the K7. Even out of the weaker 3.5mm output, the 600mW @32 Ohms is enough power to easily drive an HD650, but I still feel that large planars do sound better when given more from the powerful balanced output with it’s 2.1 Watts @32 Ohms, which is great if you already have a balanced cable, but was a bit of a bother for me, since I’ve mostly got either 3.5mm or 6.3mm plugs on my higher end full size headphones.

The main volume control is excellent.
It is a stepped digital control.
Every step you feel in the knob controls one ‘step’ in the amp.
• From 0-24, every volume step is in 3s.
• From 24-52, every step is in 2s.
• And from 53-62, every step is in single digits.
This gives you a really well designed balance between control and convenience.

The right control knob for treble, bass and microphone volume all works in single steps.
Treble from -6 to +6, bass from -12 to +12 and microphone from 0 to +10.

The microphone input has some noise reduction and overall worked fine for me, although I don’t have a use for this as I use my Rode NT-USB microphone for that sort of thing.
I’m also not sure how well the noise reduction works because I don’t live in a noisy environment and it’s just not that interesting for me.

Tone Controls
The tone controls however was more of a hot topic and something I was very interested in hearing.
The K5 had some very decent tone controls for the price and size of the device, but ultimately was a coloured amp.
The K7 is an improvement over the K5 in that regard, with what sounds like an almost perfectly neutral output when no tone controls are applied.

This graph shows the stock/neutral output of a Sennheiser HD650 measured on a miniDSP EARS, shown in green, compared with tone controls at both their maximum and minimum extremes, shown in grey.
Purple lines show inverted max and minimum values (e.g. – max bass + min treble).

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Here is another graph with K5 tone controls overlayed, shown in blue.
The K7’s bass control has more swing in both directions, but less in the treble.
I think this is fine.
There was never any moment I felt that the K7 didn’t have enough versatility in the treble.
A significantly more important topic is the affected range.
The treble is fine. No complaints there.
The bass however is not great.

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I was really impressed with the K5’s bass control when I reviewed it last year.
It only significantly manipulates bass up to around 300-400hz and remains fairly linear in the way it focuses on raising lower frequencies over higher bass, effectively adding something close to a bass-shelf.

The K7, affects a larger range, with a non-linear focus that humps at around 100hz.

Unfortunately, this can directly contribute to headphones sounding boomy instead of deeply thunderous or authoritative.
If your goal is only to make small adjustments, then it’s totally fine, but big corrections, like those I made with the K5 for the infamous Sony MDR-SA3000 are just not tasteful with the K7.

As a 'DAC/Pre-amp'
I also gave the K7 a good run as a standalone DAC which was chained to the Fosi Audio SK01 for occasional 6.3mm use, or as pre-amp + tone controls to my STAX SRM-313 (feeding STAX SR-Lambda & Kaldas Research RR1)

I found nothing to complain about this combo, as the K7, much like my other favourite Fosi Audio amps, have a dead-silent background and can pair very well with ultra-revealing electrostatic headphones through which I detected no audible background humming or hissing even at full volume.
Only the most hyper-sensitive IEMs will be able to pick up a very quiet background hissing that only plays when audio is playing, and disappears about 10 seconds after playback stops. It was undetectable with all my headphones and IEMs, but it’s something to be aware of.

And finally, using Bluetooth as the source input is only recommended for music listening, as there was some delay between video and game action on screen - although this could be due to my outdated Bluetooth dongle adapter.



Conclusions

If you’re looking to move up from your simple entry level DAC amp combo and you either need something with more power or much more versatility, there aren’t many options at this price point.

This is one of the most powerful amplifiers around under $200, one of the most feature-rich, and most importantly, it doesn’t slouch in musical performance.

Link to the kickstarter purchase page

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Ianbanz

New Head-Fier
Fosi Audio K7 Review : Gaming Meets Audiophile
Pros: 1. Versatile functionality: Serves as a DAC, headphone amp, and preamp, from gaming to music.
2. Balanced sound signature: Warm, natural tonality with excellent detail, wide soundstage, and precise imaging.
3. Gaming prowess: Low-latency Bluetooth aptX LL and immersive soundstage enhance gaming experiences with pinpoint accuracy and cinematic depth.
4. Solid build quality: Sturdy metal body with tactile knobs and buttons, usual quality you get on all fosi gears.
5. User-friendly interface: Intuitive controls, multifunction buttons, and a clear orange LCD display simplify operation for beginners and advanced users.
6. Effective as a preamp: Pairs beautifully with tube amps, delivering a clean, articulate sound with warm, lush mids and smooth highs.
7. Affordable price: Offers exceptional performance and features for its price range, competing with higher-tier devices.
Cons: 1. No balanced XLR outputs: Limits connectivity options for audiophiles with balanced setups.
2. Bluetooth: No LDAC support. (nitpicking)
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The Fosi Audio K7 is an intriguing device that manages to blend high-quality audio with gaming-focused performance seamlessly. It’s packed with features and functionality, earning it the nickname I’ve given it—Fosi’s “Swiss Army knife of audio.” From its multi-purpose design to its rock-solid hardware, the K7 is built to handle a variety of use cases while delivering a surprisingly immersive and enjoyable sound experience.

I put the K7 through its paces, using the USB input as my primary connection and running a mix of my go-to test tracks alongside my daily Tidal playlist. After hours of listening, I can confidently say this little device is more than just a jack of all trades—it’s a master of quite a few. It left a lasting impression on me, offering versatility and audio quality that exceeded my expectations.

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Whats In The Box? Here is a quick unboxing video of the Fosi Audio K7.



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The build quality of the Fosi Audio K7 is exactly what you’d expect from the brand—rock solid and built to last. The thick metal body gives it a sense of durability, and it’s surprisingly hefty for a gaming DAC/amp. The moment you pick it up, you can feel its sturdiness and quality.

One of my favorite touches is the tactile notches on the knobs. Every turn feels precise and satisfying, adding a sense of precise conotrol that complements the overall premium build. It’s the kind of design that not only looks good but also feels great to use.

Fosi Audio designed the K7 with both functionality and ease of use in mind, making it an excellent option for anyone who values versatility without unnecessary complexity.

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Sound Performance

At the heart of the K7 lies the AKM AK4493SEQ DAC chip, implemented thoughtfully to balance musicality and analytical precision. It retains AKM’s signature warm and natural tonality but adds a level of detail and imaging that stands out. The soundstage is impressively wide and deep, giving tracks an expansive sense of space and clarity. Imaging is precise, allowing instruments and effects to be pinpointed effortlessly within the mix.

Despite the extra layer of detail, the sound never feels clinical. It maintains a smooth, engaging quality that is easy to listen to for hours. Whether you’re gaming or enjoying music, the K7 delivers a sound signature that feels both dynamic and refined.

Interface and Build

Fosi Audio truly nailed the design of the K7, making it both intuitive and user-friendly. The multifunction control knob is a intuitive feature, allowing you to seamlessly switch between tone controls and the mic input, different outputs and inputs of your choosing. It’s straightforward enough that even those who skip the manual can figure it out quickly. The orange LCD display is a nice touch, giving you a clear overview of your settings at a glance.

Beneath the control knobs, you’ll find five multifunction buttons, each serving a specific purpose:

1. Power and UAC Mode: The first button powers the K7 on and off and toggles between UAC 1.0 and 2.0 modes, depending on your device’s compatibility.


2. Input Selection: The second button lets you switch between USB, coaxial, optical, and Bluetooth inputs.


3. Output Selection: The third button determines your output—headphones or external devices like RCA. On the front panel, you can also toggle between the 3.5mm and 4.4mm headphone outputs.


4. Bypass Mode: The fourth button activates bypass mode, disabling the tone controls to give you the pure, unaltered sound of the DAC chip.


5. Control Mode: The fifth button toggles between microphone volume, bass, and treble adjustments. These can be fine-tuned using the second knob, while the first knob is dedicated solely to controlling the main volume.


The build quality of the Fosi Audio K7 is exactly what you’d expect from the brand—rock solid and built to last. The thick metal body gives it a sense of durability, and it’s surprisingly hefty for a gaming DAC/amp. The moment you pick it up, you can feel its sturdiness and quality.

One of my favorite touches is the tactile notches on the knobs. Every turn feels precise and satisfying, adding a sense of precise conotrol that complements the overall premium build. It’s the kind of design that not only looks good but also feels great to use.

Fosi Audio designed the K7 with both functionality and ease of use in mind, making it an excellent option for anyone who values versatility without unnecessary complexity.

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As a DAC Amp Preamp

Using the K7 as a DAC preamp for my passive bookshelf speakers, paired with the Fosi Audio MC331 tube amp, the synergy was remarkable. The K7’s clean, articulate sound signature complements the smooth, balanced tonality of the MC331. With 5654W tubes, the MC331 adds a warm, organic layer to the already refined sound of the K7, enhancing midrange detail and vocal richness.

The bass is authoritative—weightier, textured, and slightly more rounded than my Xduoo MH-02 with stock Chinese 6J1 tubes. It’s not boomy or exaggerated but instead delivers tight, musical low-end performance that fills the room with warmth and body.

The midrange is where the combo truly shines. It’s lush, organic, and slightly romantic. Vocals are creamy and emotional, making acoustic tracks feel intimate and captivating. Instruments like guitars and pianos come through with natural timbre, a hallmark of AKM DACs when implemented well.

The highs are smooth and well-extended, offering airy detail without harshness. Cymbals and strings have a refined sparkle that avoids sibilance, making long listening sessions fatigue-free.

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Gaming Performance

When it comes to gaming, the Fosi Audio K7 is in its elements. I tested it as a gaming DAC/amp by pairing it with my Meta Quest 2 VR goggles over Bluetooth using the aptX LL codec, alongside the 7Hz Elua IEMs. The low-latency connection was flawless, delivering near-zero lag even during the most intense, fast-paced gaming moments. For my test, I dove into Iron Rebellion VR, a mech combat simulator that demands both precision and immersion—and the K7 didn’t disappoint.

The experience was nothing short of jaw-dropping. The AKM DAC chip’s incredible detail retrieval and holographic spatial sound brought the game to life in a way that felt cinematic. The weighty thuds of my mech’s footsteps felt impactful, the explosions were deep and earth-shaking ( thanks to the deep rumbly subbass of the 7hx elua) and the metallic clangs of battle echoed with realism. The K7’s imaging is so precise that I could pinpoint the trajectory of incoming missiles with remarkable accuracy, giving me a distinct competitive advantage.

It’s not just the clarity and precision that impressed me, though—it’s how immersive everything sounded. The soundstage felt vast and three-dimensional, enveloping me in the game’s environment. The details were so vivid that I could hear subtle cues, like the faint whirring of a distant mech preparing to engage or the subtle hiss of hydraulics under strain. These nuances added a new layer of depth to the gaming experience, making it not just fun but downright exhilarating.



I’ve included a gameplay video from my testing session with the K7. Turn up the volume, and you’ll get a taste of just how intense and immersive the experience is—especially during those frantic combat moments. You can hear every ping, crash, and explosion with crystal clarity, showcasing just how well the K7 handles the chaos of battle.

The K7 proved itself as more than just a capable gaming DAC/amp—it’s an immersive powerhouse that enhances both the emotional and competitive aspects of gaming. If you’re into fast-paced shooters or atmospheric RPGs, it’s a device that brings every detail to life.

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Final Thoughts

The Fosi Audio K7 punches well above its weight, offering versatile functionality, excellent sound quality, and gamer-friendly features at an affordable price. Its warm, detailed sound signature makes it a standout for music lovers, while its immersive imaging and usb type c or aptX LL Bluetooth performance make it a perfect companion for gaming.

For a DAC/amp that balances audiophile-grade sound with excellent gaming performance, the Fosi Audio K7 is hard to beat. It’s an intuitive, polished device that will enhance both your listening and gaming sessions.

Link: https://www.kickstarter.com/projects/fosiaudio/fosi-audio-k7-gaming-headphone-amp-dac
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