iFi Audio GO Bar Kensei... The Ultimate GO Bar Has Arrived!
Mar 18, 2024 at 8:11 PM Thread Starter Post #1 of 273

iFi audio

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Our latest GO Bar is akin to a legendary sword meticulously forged for a Kensei.

Embodying the dedication of a master swordsmith, we focused on purity, balance, and refinement to deliver an experience that cuts through the noise of everyday life and reveals the true essence of your music.

GO bar Kensei by iFi audio

GO bar Kensei by iFi audio


The Ultimate GO bar.​

Just as a Kensei deserves an exceptional blade, an audiophile deserves an exceptional DAC.

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Forged for Masters of Audio.

GO bar Kensei is akin to a legendary sword meticulously forged for a Kensei. Embodying the dedication of a master swordsmith, we focused on purity, balance, and refinement to reveal the true essence of your music.
Featuring cutting-edge Japanese audio processing technology: K2HD, and improved power supply and clock circuitry, the Kensei represents the pinnacle of our journey of refinement in the GO bar range.
Whether you’re commuting, working remotely, or traveling for pleasure, the GO bar Kensei offers a perfectly portable solution to elevate your headphone experience to heavenly heights.
Kensei is a Japanese term that translates to “Sword Saint” in English, a title granted to the elite few who elevate the craft and artistry of swordsmanship beyond even that of the finest swordmasters.


Echoing this philosophy with each of its components, the GO bar Kensei is the world’s first ultraportable DAC to feature the renowned K2HD technology.

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Revitalise studio recording sound with legendary K2HD.​

Despite their pristine clarity, digital recordings sometimes seem emotionally flat and lifeless.

Engineers at the prestigious Victor Studio, troubled by the discernible lack of emotion between their original masters and digital sub-masters, embarked on a quest for a solution.

They meticulously compared countless finished recordings with the copy recordings by ear, relying on their instinctive feel and their human expertise.
Their solution; K2 Technology*.

The K2 Technology process revives rich, natural harmonics into the sterile, detached digital sound, adding an organic quality unlike any other.
K2 Technology processing revitalises the studio recording sound, infusing it with life once again.

*Read our Tech Note for more information.

“K2 Technology” and “K2HD” are registered trademarks of JVCKENWOOD Corporation.

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Tailored. Sweet Sound.

Listen the way you like with four bespoke digital filters and two analogue processing modes, each tailored to enhance your enjoyment across different music genres.

  • Bit-Perfect: Delivers natural tones, ideal for all genres.
  • GTO: Enhances sound details and density, particularly suited for Vocal tracks.
  • Minimum Phase: Produces a warmer sound, blending characteristics of Bit-Perfect and Standard, perfect for Soul and Jazz.
  • Standard: Offers a tighter sound with controlled highs, perfect for Pop music and Movie OST.
Experience chest-thumping bass with XBass+ and immerse yourself in a spacious sound field with XSpace.



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Advanced chip. Accurate clock.

The DAC section of the GO bar Kensei uses a powerful 16-core XMOS micro controller to process the audio data received at the USB input. Our in-house team has programmed the XMOS firmware to optimise sound quality and ensure a perfect partnership with the 32-bit Cirrus Logic DAC chipset.

A customised digital filter minimises pre-echoes and ringing artifacts. Our GMT (Global Master Timing) precision clock system ensures ultra-low jitter.

Supports higher-than-streaming audio formats:


  • PCM up to 32-bit/384kHz
  • Native DSD playback up to DSD256
  • 2x DXD
  • Full MQA decoding
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Compact and Powerful.

The GO Bar Kensei is crafted with Japanese stainless steel for maximum rigidity.

With its compact dimensions of 65 x 22 x 13.2 mm, it matches the size of a USB flash drive. This makes it the perfect travel companion for your mobile, tablet or MacBook Pro, blending into your life for headphone use.

Its USB-C connectivity ensures plug-and-play convenience, allowing for hassle-free use.

The GO Bar Kensei offers a maximum output power of up to 477mW, which is about 10 times more powerful than an iPhone 15*.

It incorporates two power tuning technologies: iEMatch for high-sensitivity IEMs, and Turbo mode for power-hungry headphones. This allows it to easily drive a wide range of premium earphones and headphones.

*Compared to iPhone’s USB-C to 3.5mm Adapter.


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K2HD Processing revives rich, natural harmonics into emotionally flat and lifeless digital recordings.
The unparalleled originality of K2HD lies in its advanced high-frequency extension, enabling the restoration of natural harmonics and overtones beyond 22kHz, delivering audio quality that is close to the original master.


The XMOS 16-Core chip processes the audio data received via the USB digital input.
This new low-latency XMOS microcontroller has greatly enhanced processing power. Compared to the current generation of eight-core chips, this new 16-core IC delivers double the clock speed (2000MIPS) and four times the memory (512KB), as well as the latest SuperSpeed USB standard.
iFi’s in-house digital development team has programmed the XMOS firmware to optimise sound quality and ensure a perfect partnership with the 32-bit Cirrus Logic DAC chipset used in the GO bar.


Extensive jitter-eradication technologies are applied to the digital stage, including our GMT (Global Master Timing) femto-precision clock and intelligent memory buffer. This represents a total ‘out-of-the-box’ systematic digital solution that solves jitter once and for all.


Hi-Res True Native® playback of all music formats from MP3 to DSD256, PCM384 and DXD384.


TDK C0G (Class 1 ceramic) capacitors offer high stability and low losses for resonant circuit applications.
Getting ever closer to the theoretical ideal of pure, frequency-constant capacitance, these capacitors reduce capacitor-induced distortion to vanishingly low levels.
They are pricey but are a perfect addition to our products.

Panasonic OS-CON caps totaling 5,410uF give very-low Equivalent Series Resistance (ESR), excellent noise reduction capability and frequency response characteristics. In addition, OS-CONs have a long-life span and its ESR changes little even at low temperatures since the electrolyte is solid.
They are not often found in products costing <US$1000.


Tantalum capacitors are another example of the top-notch components we prefer. These polarised electrolytic capacitors have superior frequency and stability characteristics, giving them a super high volumetric efficiency.


muRata control-type, low-ESR high-Q multi-layer capacitors. The ‘ESR control’ aspect of the Murata is something special. Their noise suppression abilities are impressive.


The GO bar’s analogue circuitry features balanced design with a symmetrical twin-channel output stage.
This topology, usually reserved for larger and more expensive amplifiers owing to its cost and complexity, reduces noise and crosstalk in the signal path by fully separating the left and right channels.


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Get Yours First through our distributors...
HERE!


For more information on K2HD Tech by JVCKENWOOD Click Here!

Cheers!!


EDIT NOTE:

Make sure to update your GO bar KENSEI to the latest firmware upon receipt to ensure optimal performance.

Simply click here and enter your information!

https://ifi-audio.com/support/download-hub/


For those new to updating iFi devices, check out our update guides here:
Windows
Mac

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A note On the K2 HD used in the GO Bar Kensei...

“The K2 parameter values provided by iFi this time are completely new K2 parameter values that have never been used before and were selected by JVCKENWOOD and passed a listening test by studio engineers at Victor Studios. While previous K2 parameter values were set with consideration of correcting the sound quality of the product itself, the K2 parameter values provided this time for iFi are purely the settings for the best K2 effect. In this sense, it can be said that the K2 parameter values allow you to hear the original ideal "K2 sound.” commented, JVCKENWOOD.

“K2 Technology” and “K2HD” are registered trademarks of JVCKENWOOD Corporation.
 

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iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
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Mar 18, 2024 at 9:41 PM Post #4 of 273
Oh wow the JVC K2 technology? I am definitely gonna try it
 
Mar 19, 2024 at 4:47 AM Post #8 of 273
So GTO filter is basically not a filter (it's a forced oversample mode with super slow filter ultrasonics)?

Bit perfect is NOS?
Min phase is slow?
Standard is SD fast?

And K2 is XMOS offloaded proprietary interpolation requiring upsampling of all incoming rates to their 44.1/48 max? (Similar to OS on the RU6)
 
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Mar 19, 2024 at 6:02 AM Post #9 of 273
Few hours after the announcement and here we are….
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The Gold Bar still feels a bit heavier in my hands. Did a quick comparison between K2HD enabled Kensei vs the Gold Bar: the Kensei seems to emphasize the background music more than the Gold Bar and has a slight sparkle somewhere in the vocals. I go back to the Gold bar and the sound became more mid-forward and warmer.

I wouldn’t say there’s a huge difference between the two in terms of sound but I’ll probably need more listening sessions comparing the two. In short: the Kensei is a nice dongle and I’ll keep the K2HD on for now.
 
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Mar 19, 2024 at 7:59 AM Post #10 of 273
Few hours after the announcement and here we are….
IMG_0935.jpeg
IMG_0936.jpegIMG_0937.jpeg

The Gold Bar still feels a bit heavier in my hands. Did a quick comparison between K2HD enabled Kensei vs the Gold Bar: the Kensei seems to emphasize the background music more than the Gold Bar and has a slight sparkle somewhere in the vocals. I go back to the Gold bar and the sound became more mid-forward and warmer.

I wouldn’t say there’s a huge difference between the two in terms of sound but I’ll probably need more listening sessions comparing the two. In short: the Kensei is a nice dongle and I’ll keep the K2HD on for now.
Congrats!

Looking forward to your further thoughts and impressions when you can!

Cheers!!
 
iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ https://www.youtube.com/@iFiaudiochannel comms@ifi-audio.com
Mar 19, 2024 at 8:34 AM Post #12 of 273
iFi audio Stay updated on iFi audio at their sponsor profile on Head-Fi.
 
https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ https://www.youtube.com/@iFiaudiochannel comms@ifi-audio.com
Mar 19, 2024 at 11:39 AM Post #14 of 273
Very very early impressions in short snippets, with more to come…. Tiny, and built like a tank. Minimalistic and clean feel. Very rich and full sounding. XBass is addictive. There is oh so much power - so far for headphones I have driven my Aeon Noire and my Meze 109 Pro, and for IEMs Pula Pa02, Penon Quattro, Penon 10th AE, and Hidizs MP145 without the Kensei breaking a sweat. MQA support is there if you want it. The real standout impression, though, is as I noted above… very rich and full sounding.

More to come!
 
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Mar 19, 2024 at 12:00 PM Post #15 of 273
Is nice to see more dongles being manufactured. I've read the power consumption is high 4W maximum? Not sure how that translates in real use scenarios. Hopefully not as much as the DC Elite.
Does it need drivers for Windows 10,11 etc? And will there be firmware updates in the future or not?
I like the design, congratulations. Reminds me of old AM/FM radio.,😁
 

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