Author Topic: USB DAC's / USB i2s chipset (XMOS)  (Read 329 times)

Offline gavinbirss

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USB DAC's / USB i2s chipset (XMOS)
« on: February 04, 2017, 09:11:27 PM »
cleaning my table

For sale

A - DAC-24192-ABR
     5V only / ES9023
     Requires Pi or USB i2s chipset
     R 1000

B - 2 X XMOS DSD DXD 384kHz high-quality USB to I2S/DSD PCB - XMOS option : XMOS PCB   
     R 800 (soldered) / R 850 (un-used)

C - 2 X XMOS Multichannel high-quality USB to/from I2S/DSD SPDIF PCB - XMOS firmware : 384k 6ch out 4ch in + SPDIF out
     (requires up to 800ma 3.3V)
     R 1200 (soldered) / R 1300 (un-used) + 0.96" OLED display

D - ES9018K2M
     (assembled / requires I2S connection(Pi)/USB chipset + power (+-12V + 2 x 3.3V])
     R 1000

Please add R 99 postnet to each or combination.

PM if more info needed

     


« Last Edit: February 04, 2017, 09:21:50 PM by gavinbirss »

Offline Prince

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Re: USB DAC's / USB i2s chipset (XMOS)
« Reply #1 on: February 06, 2017, 08:28:45 AM »
Hello  gavinbirss

So, which of these gave you the best sound, if paired with a RPi?

 :cool:

"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline gavinbirss

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Re: USB DAC's / USB i2s chipset (XMOS)
« Reply #2 on: February 06, 2017, 08:41:36 AM »
Hello  gavinbirss

So, which of these gave you the best sound, if paired with a RPi?

 :cool:

If used directly to Rpi is will come down to personal preference. 9018K2M was a little fussy the last time I tried with Rpi (software, Rune, squeezelite)

How well the Rpi (squeezelite/MPD) works will most determine quality. A reclocker would be the expensive option to increase performance. (If Kali, DAC needs to be slave)

A is more convenient as it only needs 5V, the cleaner the better. Although it is not a plug-over GPIO pins board. (needs 6 dupont wires)
D needs 4 extra clean supplies. (+12, -12V, +3.3V, 3.3V)

I rather like the sound of the 9018K2M, if used with USB i2s and X86 PC the added benefit will be DSD64/128.

You could also opt for USB (i2s chipset) to Rpi but this may produce buffering due to USB bandwidth problems.

Compared to the IQaudio Pi-DAC+ (BB/TI 5102), I prefer the sound of A, then D.
The quality of the power to the Rpi will be a factor.






« Last Edit: February 06, 2017, 08:46:42 AM by gavinbirss »

Offline Prince

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Re: USB DAC's / USB i2s chipset (XMOS)
« Reply #3 on: February 06, 2017, 09:02:09 AM »
 :cool:

Thanx for the info. The digital clock issue on the RPi, has it been addressed on any of these boards? Or do I need an extra digital clock board to address it?

"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline gavinbirss

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Re: USB DAC's / USB i2s chipset (XMOS)
« Reply #4 on: February 06, 2017, 10:23:41 AM »
:cool:

Thanx for the info. The digital clock issue on the RPi, has it been addressed on any of these boards? Or do I need an extra digital clock board to address it?

A and B were not made with the Rpi in mind. A FIFO buffer/reclocker and good power is what the Rpi would need for better i2s. The quality and speed of (19.2Mhz) clock on the Pi is the sample rate/quality issue.
Recently there were alsa/kernel patches to get 384Khz from the Pi.

Although both A and D have high quality clocks for MCLK for the DAC chip...
A was designed for the Beagle Board.

Choosing DSD to PCM resampling will require CPU power. A real-time kernel is a must on the Pi/(music server)


« Last Edit: February 06, 2017, 10:33:18 AM by gavinbirss »

Offline Prince

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Re: USB DAC's / USB i2s chipset (XMOS)
« Reply #5 on: February 06, 2017, 10:45:44 AM »
 :cool:

Ok Cool, that explains it.

"F5 Amp Power + Pedal Power = F5 Pedal Power"