FX Audio DR07

All the features you would want from a headphone amplifier on a budget​

In this review, I want to share my experiences with the FX Audio DR07 which I have been using (with its ‘sister’ Amplifier the R07Plus) for the past few weeks. I feel both these product represent a “rebirth” for FX-Audio with highly competitive performance and excellent designs at very pragmatic prices.



My previous experience with FX-Audio products was with the rather excellent (for the price) FX Audio DAC X6, a few years agp. Having used the DR07 for a few weeks, I feel this DR07 is the spiritual successor to that product, where FX-Audio have effectively improved on every aspect of that device with better measurements, an up-to-date design, more power and even a nice little display added.

But let’s get into the details.


Note: I would like to thank FX-Audio for providing the DR07 for this review. It currently retails for around
If you are interested in checking out the D07 - this their product page: FXAudio D07 or you can buy via HiFiGo, Amazon USand Aliexpress

Introduction​

The FXAudio DR07 is an all-in-one DAC and headphone amplifier designed to meet a wide range of HiFi desktop audio needs and as you will see I believe is the perfect starter headphone amplifier (and maybe the only one you will ever need).
And with its high-performance dual AK4493 DAC chips and lots of digital input options, it is also a very powerful with power for all IEM’s and almost all headphones you more than likely every own.

What’s in the box​

The box is a fairly basic box with some nice branding:



The packaging includes the DR07 unit itself, a Bluetooth antenna, the power supply, and a remote control. Additionally, a USB cable was also provided.

Note: As you will see the usb input on the back of the DR07 is the ‘old fashioned’ USB-B connection (like a printer USB). I would have preferred a usb-c connection but given they provide the cable it is not a big deal.


Overall it is a nice package with everything you need to get started:

The Amplifier:​

Button Layout and Connections​

The DR07 features a well-organized front panel with a small LCD screen displaying critical information like file format, sample rate, and volume level. The panel also includes power and input selection buttons, along with headphone outputs of 3.5mm and 6.35mm.




I was a little disappointed that there wasn’t a 4.4mm balanced output and a 6.35mm SE output but given the power capabilties of this little headphone amplifier it is not that important. The other FX-Audio headphone amplifier (the R07Plus which I will post a review about in a few days) does have balanced outputs but it is for a different target market than the DR07.

On the back, the DR07 accommodates a variety of connections including USB, optical, coaxial inputs, and both RCA outputs and optical outputs.



I think the inclusion of both optical input and outputs is a nice touch, as you can immediately integrate this an ‘digital’ audio stack where you might already have a streamer (like a WiiM Mini / Pro) feeding optical into an existing DAC and you just want to add a powerful headphone amplifier without needing to do any ADC/DAC conversions. It also makes this a great ‘starter’ headphone DAC amplifier as you have many options for how you can use this device as your system grows.



The USB also support goes up to DSD512 with the Optical and Coaxial supporting the max of 192Khz.

Features​

The DR07 stands out with its dual DAC setup, utilizing AK4493 chips for detailed and low-distortion sound output.

It supports high-resolution audio up to 32-bit/768kHz PCM and DSD512. The unit also features Qualcomm’s latest QCC5125 Bluetooth chipset, ensuring high-quality wireless connectivity with support for advanced codecs like LDAC, AAC and AptX HD.

Here is my Macbook feeding PSM 768Khz into the DR07:

The DR07 also supports MQA which at one point would have been an excellent addition, but I believe MQA is slowing dying, but I guess if you have MQA content its great to have that option availalbe.

The screen on the front is best suited for ‘desktop’ usage where you are close enough to read the values as it is too small to read values across a room for example. I personally found the similarly priced FiiO K11 screen easier to read, but it is a good option to have a screen to change things like the filters and Gain levels at this price point. Here are 2 short videos of the operation of the DAC.

Here I am switching it on and toggling the inputs:

And here I am using the Volume control to change gain levels and access the filters. You do this by pressing and holding the volume and then rotating the volume either left or right to switch between the options:


The remote Control can be used to change these same features, though because I mainly used this on my desktop I did not use it that much as the buttons on front are good enough to change most options.

Listening and Sound impressions​

I mainly used the USB input from my MacBook, but I did try optical from a WiiM Mini 'streamer' and occasionally I used bluetooth AAC from my iPhone as inputs into the DR07. They all operated as you should expect so I would imagine you will have no problems depending on which input you use for this DAC. I also feed the RCA outputs into a Fosi Audio V3 and it provided excellent quality audio into that excellent Class D amplifier. But my main listening was via the headphone outputs.

The DR07 delivers a neutral and analytical sound signature, which can be particularly appealing for users seeking clarity and detail in their music. Unlike the older headphone DAC Amplifiers like DAC X6 which used to have a ‘roll off’ of bass and especially the treble, in my listening tests the DR07 was perfectly transparent with no colorisation of the music at all.

I used a few different Hifiman planar headphones (including the Edition XS and the HE400se ) and at no point was I even near the maximum output (typically it was a 50% or less), there was no danger of it ‘running out of juice’ when driving these headphones during heavy bass led tracks like James Blakes ‘Limit to your Love’ or the Massive Attack ‘Angel’. In tracks like Bjork’s ‘Hunter’ the provided excellent clarity as the music panned rapidly between left and right ears, showing no ‘crosstalk’ issues.

I subsequently went through my long playlist and really enjoyed the experience, some classic Elton John tracks with their ’exaggerated’ piano soundstage was particular impressive, allowing me to pick out individual piano’s in 3D space. Some people might want more ‘colourisation’ with their music but my personal preference is always for a headphone amplifier to transparent.

I did switch over and tried some very sensitive IEM’s to see if I could hear any ‘artifical’ noise floor, and it was perfectly transparent, in fact, my test tracks for noise - John Cages - 4.33 sounded wonderful - in that if you ramp up the volume, you should be able to hear a ticking clock in the background as well as some doors opening and some plates clinking and it sounded very ‘clear’ on this amplifier.

The DR07 offers well-controlled bass, transparent midrange, and extended treble,
making it suitable for a wide range of headphones, from dynamic to planar types.

Specifications and Measurements​

Frequency Response​

The DR07 maintains a flat frequency response within a very tight deviation, ensuring accurate sound reproduction across the audible spectrum. The rated FR is +/- 0.3db up to 40Khz. Once some Audio Precision measurements become available I will update this section of the review.

Rating​

The FXAudio DR07 is highly recommended. I gave it a 4 star pragmatic rating. It is perfect for those in search of maybe a first time DAC-amp combo that offers detailed, high-resolution audio performance at a competitive price point. With its digital input and outputs it can also provide a great high quality headphone addition to an existing audio stack. The lack of a balanced output and the small screen being the only negatives.

Summary​

Overall, the FXAudio DR07 is an impressive DAC and headphone amplifier that excels in functionality and audio performance. Its combination of advanced DAC chips, powerful amplification, and versatile connectivity options make it a standout choice for both casual listeners and audiophiles on a budget.

Disclaimer:
Good morning, readers! This time, I received a product from FX-AUDIO, a brand that somehow introduced me to this hobby. My first product, or rather, the first desktop DAC that I purchased years ago, was the FX-AUDIO X6. It cost just over $50 and was considered a miracle. It was difficult to explain such a price, but those who owned the first models and had the opportunity to look inside for some OP-amp upgrades know that the components were recycled (second third life) and the welds were completed quickly. Surprisingly, it worked especially well; subsequent versions were much more precise in their soldering.
I also tried the Tube 01, which is a type of tube buffer pre-amp, but it is no longer in use.
After several years, FX-AUDIO finally releases a new model, which obviously piqued my interest.
Despite having a lot of Dongles, I did not have many Desktop DACs and DAPs, but I will try to conduct a thorough analysis.
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:


For convenience, I have taken the specifications from the manufacturer's website, which, however, omits some specifications that may be of interest to those who purchase it.
To recover some information, I had to take it apart.
In the manual, there is information missing from various sites and the only extra thing I couldn't find is the OPA1656. But in its place, I found the following:
Upgradeable dual OP-amp: LM4562NA
For the headphones section, I found a TPA6120A2 and I found an AKM4118, which is responsible for OPT and COAX inputs.

Packaging:

For me, who has already bought FX-AUDIO products, the packaging is nothing new. The box is all white and very anonymous; it looks like a pre-release product with a box that is not totally definitive but I don't think there will be any changes.
At first glance, I noticed the Hi-Res logo had a slightly "copied" appearance.
Inside, we can find:

• Power supply: 12V/2A
• BT antenna
• Remote
• USB cable
• Manual

The product is carefully packaged, the accessories are of high quality, and the USB cable appears to be from another brand, but I replaced it (there is no change in sound, only in appearance). Perhaps an optical cable could have been included.

Build Quality/First Impressions:
Having previously handled their products, I can assure you that the quality has always been high in comparison to the price, albeit not perfect. In my unit, I noticed that the volume knob was not perfectly aligned. When I disassembled it, I discovered a somewhat artisanal shim inside where the pin is housed to keep the knob from touching the chassis. On one side, there are two micromarks where the paint has worn off.

Let us assume that quality control can be improved further. The front panel includes a physical on and off button, as well as 3.5mm and 6.35mm inputs; however, there is no balanced output. The volume knob is also used for other functions that make the remote control more useful.

Behind, however, we really have a lot of inputs, even though personally, I almost always use the USB input but in reality, it is a much more versatile product.
In terms of size, it is much larger than the old Fx-Audio X6, and it also warms up significantly more in use. Out of curiosity and to discover its secrets, I opened it. I can tell you that the PCB is quite clean and decidedly more refined than in the past. There are still some traces of flux but otherwise, the soldering seems well done.

I forgot to talk about the small display; some details need to be significantly closer to be readable. I must admit that it looks a lot like the display that could be used on a Dongle. It still fulfills its function.


Configuration:

The FX-AUDIO DR07 replaced the old X6 on my desk. The outputs that I will currently use are the RCA ones with which I enter a Breeze Audio (BRZ hifi) TPA3116 amplifier, which is now a few years old but does its job perfectly. It is not the chain for absolute Hifi quality but one of the cheapest that could be put together a few years ago. As speakers, there are a pair of Scythe Kro Craft Rev. B. For those who know them, you will know very well that they are not perfect at all but for 50 USD per pair, they are absolutely crazy. The only flaw is the tweeter is a little too cut; he seems shy and too directional.
The USB cable is custom, short, and "hi-fi" but it significantly reduces tangles. The original one is fine but too long for my purpose.

Let me start by saying that they are not high quality speakers but compared to the X6, I noticed a much better sound. I would have liked the tone controls but unfortunately, they cannot be adjusted. The sound appeared clearer and above all, the highs came to life slightly. Operation via remote control is the most welcome thing ever. By now, I have gotten used to some products with remote control and volume control is a must have. Fortunately, you can also adjust a few settings, such as manually selecting the input, selecting whether to leave the output automatically (if you insert headphones, the RCA outputs are deactivated) or in ALL, where both remain active.

As on the old model, when it goes into play/pause, there is a sort of "click," but honestly, it doesn't cause me any annoyance or problems. I think the outputs are disconnected to avoid background noise.


Digital Filters & Sound Signature:
There are some digital filters available; in total, there are 6:

1. Short Delay Sharp Roll Off
2. Short Delay Slow Roll Off
3. Sharp Roll-off
4. Slow Roll-off
5. Super Slow Roll off
6. Low dispersion, Short Delay

The changes are extremely minimal; the slightly greater difference is felt from the sixth to the first filter. I'm happy there are some functions but unfortunately, most of the buttons on the remote control have no functions. But those who have other products considered CHI-FI know that it is not difficult to see the same things on even higher-end products.

Sound Signature & Power:
The sound of the FX-AUDIO DR07 is almost neutral from both speakers and headphones. To be extremely honest, I don't think it was created to replace any headphone DAC/AMP. It doesn't impress with almost any headphones or IEMs in particular. It's not that it sounds bad but I have dongles that definitely sound better with more synergy. The thing I noticed right away is that with extremely sensitive and efficient IEMs, there is background noise and the only way to eliminate it is to use an impedance adapter. The noise is like a hiss that is heard at very low volume settings, with quiet, relaxed songs and between songs. The absolutely strange thing is that I haven't found anyone complaining about this problem. They could have tested it with only some high impedance headphones..1100 mw at 32 ohm are not very few and if the background is not very silent, you risk hearing this noise.

To exclude other problems, I started with the power supply, trying to use a different power supply with an extra 1A without success. I changed the USB cable and socket but the noise is still there.
This noise is not particularly audible, but the FX AUDIO DR07 is not suitable for headphones or low impedance IEMs.
I tested the Hifiman He400Se, Re-9, Sundara Close back, Philips Fidelio X2HR without experiencing significant background noise. I recommend keeping the gain low which is more than enough for most of my headphones.
I think it's right to point this out because it's not as universal as others with similar power. I think the background is actually not as silent as it seems. It was a different story for the RCA outputs, where I couldn't hear any kind of problem but the Scythe speakers are not very sensitive and could muffle the problem.
I noticed that after a few hours of use, it reaches quite warm temperatures, I think it depends on the listening volume but as there are no air vents, it could also heat up slowly and gradually.


Fast Comparison:

vs FX-AUDIO X6
You never forget your first love, I have to tell you that the first model was assembled in an unprofessional way, the parts were recycled and some components were rusty, it worked and it was a miracle. After several years, it failed, probably due to a mistake on my part in handling it while doing some OP amp rolling. I bought it again immediately and the new one was made with much more care and much better components. It was an excellent entrylevel DAC/AMP and still does its job. I will definitely use it on another PC. The DR07 pretty much covers all the gaps the X6 had by adopting better components and extra features. In terms of sound, the X6 seems slightly warmer to me, while the DR07 is super neutral. I don't feel like saying that great improvements have been made in terms of headphone amplification.

vs SMSL Sanskrit 10th
My Sanskrit works well but despite the slightly more renowned brand, I had to return the first unit as it created artifacts in the sound. I must say that it works very well connected to the Hivi Swans T200C but it does not have BT or headphone output. Also, in this case, the remote control has many buttons without functions. Aesthetically but also in terms of finish, it is slightly better. They are two products for a different target but if you are not interested in the headphone output, I recommend you keep that in mind.

vs Creative Soundblaster X5
The full review of this product will arrive soon. A sort of mix between desktop DAC/AMP and headphone amplifier with an eye also on gaming. In addition to having a balanced 4.4mm output, it also has a microphone input. A lot of functions are available via apps on your smartphone or software on your PC. We can create custom EQs, update firmware, and much more. Its versatility is superior, as is the price, but the product is infinitely more refined. The sound is slightly warm, in a Creative sound style. It resembles the Creative Sfxi AMP Dongle.


Conclusions:

Definitely a versatile product but not perfect as described by several reviewers. If you are looking for a DAC for your speakers, it is certainly very comfortable and works very well, but if you are also interested in listening with headphones or IEMS, you should know that it is not suitable for everyone. Leaving aside the background noise, I wasn't thrilled with any headphones I used; I didn't find any particular synergies. I could probably try replacing the OP-amps and see if I notice any improvement. It is absolutely perfect for what I intend to use it for, and it is far superior to the old X6.
FX-Audio is a brand with potential, I hope in the future they concentrate more on the QC which is often left out of even much more important brands. On the next I would like to see a balanced output and a slightly larger display.

Where to Buy? (non affiliate link)

• https://hifigo.com/products/fx-audio-dr07

FX-Audio- DR07
Dual AK4493
$170

Before I start this review, let me first thank HiFiGO for providing this unit in for review.

Rest assured my review is 100% my own personal opinion.
Just in case you're interested on getting this DAC – AMP, you can get it on the link below.
https://hifigo.com/products/fx-audio-dr07

Unboxing
Build Quality
The DAC-AMP itself is made from metal, very solid build quality.

The DR07 also has a small screen that shows information such as format, resolution, gain, input, and volume.

Front of the device you can find a power / input selection button, 3.5mm and 6.3mm port.
To access the menu such as gain, filters, you can use the volume knob by holding it for a few seconds.

The remote itself is made from plastic and its just meh, I also to be honest don't know what the EQ, AMP,DAC, Player button for because I mainly use the DR07 with my PC, not with other source and there is nothing mentioned on the manual either.

On the back of the device there is BT-Ant port, USB IN, OPT IN, COAX IN, OPT Out, Line Out and DC 12v In.

One thing I should let you guys know that the DR07 runs HOT after one hour of usage.

The device also supports features such as :

• MQA Decoder
• Bluetooth LDAC

Power
Rated for 1100mw di 32ohm.

Sound
Tonality : Neutral - Analytical

Bass : Snappy and Well Controlled
DR07 offers a tight, snappy, no coloration, and very great bass control tested using the HD650.
The somewhat sluggish bass of the HD650 when plugged in to the DR07, it becomes a bit snappier than usual, though in other hands, if you pair the DR07 with a very fast decay bass IEM / Headphone, lets say a planar unit, the bass might come as a bit too snappy and short decayed.

Midrange : Neutrality
The DR07 doesn't add anything to the midrange, in other words, it sounds “transparent” and honest.
It doesn't add extra note weight to the sound either, so I guess for some people the DR07 actually can be sound a bit analytical rather than having more emotions and musicality.

Treble : Extended and Airy
It looks like the DR07 has some kind of highlight on the treble section, tested using my HD650, the HD650 darker treble seems to be getting brighter a bit, not by much but its noticeable.
The decay of treble is somewhat accented as well, it sounds longer than usual, so it gives extra sense of details.

Technicality
Very Good for $170

Stage : Very Good
Reasonably Wide.
It makes the HD650 sounds a bit wider lets say compared to my audio interface (Scarlett 2i2 4th Gen), it also has proper stage layering.

Imaging : Very Good
It has no problem rendering holographical information to my HD650, though if you plug lets say a Moondrop Chu 2 as I usually test my imaging, the DR07 will make it sound almost holographical but not quite there yet, but its not 2.5D sounding either.

Separation and Positioning : Very Good
No problem or complaints from me, it has very good separation and positioning due to the fact its tonality is well controlled and more towards analytical one.

Detail Retrieval : Very Good
It has superb treble detail and decay, resolving midrange with normal decay, good bass detail but with a bit shorter decay.
*What I mean by the decay is like very short layer of lingering sounds from your music.
Or in other words, very good treble detail, good midrange detail and above average bass detail.

Conclusion
Do I recommend the FX-Audio- DR07 ?

Absolutely, its one of the better value DAC-AMP combo that you can get on the market right now especially if you're in search for a neutral – analytical sounding DAC-AMP combo.

You get a lot from $170 USD you spend, you get a well spec components, bluetooth functionality, High power output, neutral – analytical sound with very good technicality on board.

Thanks for reaching this far.

Just in case you're Indonesian or understand Bahasa Indonesia, you can watch video version of this review here


-littlenezt.