Next generation Tone Board


Does anyone know if there will be any more changes other than the addition of a balanced output?

Maybe a different DAC chip?

I have no need for a balanced output, should i simply buy this version or wait for the next generation anyway?

Best regards


Hi Yoshimitsu:
Currently, we don’t have detailed plan for next gen KTB, our audio team did work on a new version KTB with some improvement like:

  • Balanced Output
  • Add Volume Control Knob
  • Case/Housing

The new KTB is same DAC with existing version. In the meantime, our audio team are also trying to resolve Hump issue, we will update more details in the next few weeks.

Thanks for support!


Thank you so much for the answer!

Will the volume control be analog i assume?`

Best regards


@Gouwa volume control is overrate :). It adds unnecessary complexity. Volume control should be done at the preamp side or the headphone amp side.

Please keep me informed - the case would be ideal as the only one I can find in France has high postage cost. Thanks Vincent from Sydney

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I will add my 2 cents in as this board has produced better results than I anticipated and I feel that with a few tweaks it will become very popular.
Here is the priority I would suggest:
External power supply while attached to VIM of Edge-V. Ideally power VIM/Edge from Tone Board through GPIO so that a quality power supply could be used. Good clean power is critical for high end audio so a DIY (Salas) or off the shelf (iFi) would be a huge benefit.

I2s input to Tone Board. There are several “isolator” boards that improve the audio by having better clocks and/or signal/power cleaning features. Most of these are I2s and having a functional I2s would again open more markets.

Hardware volume control. Software volume control is less than idea (it works fine in most cases but I am looking at the high end applications). Yes it is better to have the volume control on the preamp but the ESS has the ability built in for hardware volume control so itis a good solution for those wanting to keep components to a minimum. There is a reason audio players such as Mood and Volumio give you the option to use hardware or software for volume control.
Balanced out for me is not a priority. Sure they look great and you have bragging rights but how many amps require balanced input?

I am no expert but I do fit the market segment that you are selling to and I am involved in a market that you are not reaching as much as I think you can.


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Forgot to mention input priority.
SPDIF has highest priority, then usb then I2s. Imagine running high end audio through I2s, computer/laptop running usb and plug your phone into Spdif (with inexpensive adapter). Phone calls would take priority, then video/video chat/gaming, then high end I2s audio. You would virtually eliminate the need for a switch/selector board. No need to swap cables.

Okay, I will stop now.


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A boatload of them out there.

A true balanced Khadas Tone Board would sell ridiculously well.

i love khadas toneboard, could someone give me a hint on how to make it the basis of a dac+4ch headphones amplifier ? it would then be ideal as an in car infotainment solution instead of the shitty and over priced car manufacturers old tech offers nowadays