Issue with Moon 100D DAC

Audio Gear DACs
1

Hi all,

My DAC doesn’t work with my Moon 100D DAC. I don’t hear any sound when it is plugged. There is sound over HDMI.

I tried to use the DAC over a powered USB hub and connected to the Raspberry Pi

volumio@volumio:~$ uname -a Linux volumio 3.10.25+ #622 PREEMPT Fri Jan 3 18:41:00 GMT 2014 armv6l GNU/Linux

It doesn’t show in alsamixer. Here’s the output when I plug it in:

volumio@volumio:~$ dmesg [ 1978.715731] usb 1-1.3.6: USB disconnect, device number 7 [ 1992.920791] usb 1-1.3.6: new full-speed USB device number 8 using dwc_otg [ 1993.205245] usb 1-1.3.6: New USB device found, idVendor=08bb, idProduct=2705 [ 1993.221532] usb 1-1.3.6: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 1993.236785] usb 1-1.3.6: Product: USB Audio DAC [ 1993.248990] usb 1-1.3.6: Manufacturer: Burr-Brown from TI [ 1993.268259] input: Burr-Brown from TI USB Audio DAC as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.6/1-1.3.6:1.2/input/input2 [ 1993.292288] hid-generic 0003:08BB:2705.0003: input,hidraw1: USB HID v1.00 Device [Burr-Brown from TI USB Audio DAC ] on usb-bcm2708_usb-1.3.6/input2

When I run “lsusb -t” I noticed there is no driver for the DAC:

|__ Port 6: Dev 7, If 0, Class=audio, Driver=, 12M |__ Port 6: Dev 7, If 1, Class=audio, Driver=, 12M |__ Port 6: Dev 7, If 2, Class=HID, Driver=usbhid, 12M

When I plug the DAC in my laptop (running Ubuntu kernel 3.11.0-15) I see a driver being loaded:

|__ Port 1: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 12M |__ Port 1: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 12M |__ Port 1: Dev 3, If 2, Class=Human Interface Device, Driver=usbhid, 12M

Is there any chance I can get my DAC working with Volumio? Thx

2

I got it working this morning by enabling the “C-Media” fix then I had to reboot the Raspberry Pi. When I run the “lsusb -t” command I now see the “snd-usb-audio” as the driver. And the DAC shows in the Playback page.

I disabled the “C-Media” then reboot the Raspeberry Pi and now it seems to work all the time. Will do more test tonight with the audio gear connected to the DAC.

3

Apparently it needs more than the “C-Media” fixe for the DAC to work. I tried the kernel at this link:
http://volumio.org/forum/fixes-for-common-usb-dac-problems-with-rpi-t328.html

The same problem reappeared, and setting the C-Media fix didn’t helped. When I reverted to “Linux volumio 3.10.25+ #622 PREEMPT” kernel it started working properly again. Anyone have an idea?

When I have it working it sounds wonderful! Thx for Volumio

4

Finally the “C-Media” fix seems to be the cure for the SimAudio Moon 100D dac!

With the new kernel I had to remove the option “options snd-usb-audio nrpacks=1” from /etc/modprobe.d/alsa-base.conf since it was preventing the snd-usb-audio module from loading.