Dac PLAYBACK MPD-3+RaspberryPi 2+Volumio1.55 choppy/ sound

Help and Support Help
1

Hello.

I wanted to point audio problems with the following configuration:

Volumio functions regularly and recognize the DAC as MPD3 but playing feel like electric shocks.

Raspberry Pi to 2 USB is connected to the DAC and external hard drive powered separately.

How can I fix?

Thank you and congratulations for the software

2

which power supply do you use?
do you also get these sounds when you are not using the dac?

3

Check the power source first.

Then read this: https://volumio.org/forum/raspberry-volumio-choppy-sound-t2685.html

In my experience usb DACs sometimes makes such problems - generally some USB HW implementations are scr…wed .
But generic problem could come from power issues.

4

Update.

I tried with another dac “Musical Fidelity VDAC 2” http://www.musicalfidelity.com/support/discontinued-products/vSeries/v-dacii/and works without problems.

I tried using a powerbank 10.000 mah 5volt output with up to 3 amps but the problem remains the same.

I also installed firmware dated 04/03/2015 by rasp-update.

MPD updated to 0.19.9.

Updated volumio with apt-get update now

I think it’s a problem of incompatibility of dac with usb driver alsa.

Did you other possible solutions.

Thanks for the support.

5

Apparently Playback Designs has a proprietary USB implementation in the MPD-3 and that might be part of the problem. Here’s a description of a patch to the Linux ALSA to handle the quirks of Playback Designs units:

mailman.alsa-project.org/piperma … 54969.html

But that was done back in 2012. I recently hooked up my Raspberry Pi B+ running Volumio 1.55 to a friend’s MPD-3 DAC, and got the same result as you.