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Topic: Help with DAC / DSD and Foobar (Read 1266 times) previous topic - next topic
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Help with DAC / DSD and Foobar

Hi all,

I have purchased some parts from DIY in HK and built everything. In Detail it is
- Isolated XMOS 768 USB PCB:
- AK4497 DAC (with specific firmware for the Isolated XMOS
- OLED Display.

https://www.diyinhk.com/shop/audio-kits/118-768khz32bit-ak4497eq-dac-i2sdsd-input.html#/ak449x_option-isolated_xmos_768k_and_dac_pcbwith_dac_chip/oled-1_3oled_and_rotary_encoder_volume_control_pcb

It was pretty easy to setup and everything is working except DSD512. I have tried almost everything and I am already in contact with the support team. However they just say it should work. I have made a screen cast and uploaded on my one drive.
https://1drv.ms/f/s!Al2Cg0XrL0I-grdkngQ1eetlZaPaSQ

Can you please have a look and help with it?  Thanks a lot in advance and have a great day

S

Re: Help with DAC / DSD and Foobar

Reply #1 –
My educated guess is:

DSD is transmited to your DAC using DoP (DSD over PCM).

As you can see in your video DSD is utilizing:
DSD64 = PCM 176.4kHz
DSD128 = PCM 352.8kHz
DSD256 = PCM 705.6kHz
DSD512 = PCM 1411.2kHz

Your max. PCM frequency is 768kHz, so your max. usable DSD is DSD256.

Btw. From the specs (page 11-13) the best THD+N and S/N is archieved at 44.1kHz or ANY DSD rate (beware: bandwidth of 20-20kHz). Except DSD512: Quote from the specs "Analog characteristics are not guaranteed when the DSD dataStream is 22.5782MHz". I assume any PCM rate has the same performance (BW 20-20kHz).

The Specs: https://www.akm.com/akm/en/file/datasheet/AK4497EQ.pdf

.halverhahn

Re: Help with DAC / DSD and Foobar

Reply #2 –
Hi,

thanks a lot. Yes you're right it transmitted via DOP which doubles the rate here.  There's another Plugin for Foobar which enables a native DSD transmissio I didn't know before. So I installed that and now it works in native mode and DSD512 also works :-)

The only disadvantage of this plugin (which is An ASIO Passthrough device) PCM 768 does not work any longer. I mean honestly :-) That's not an issue as there's almost no music on the market. However just out of interest - if there's something that you can do to enable with that ASIO device, appreciate your feedback to this :-)

Thanks and have a great day

S