storrgie

I wanted to report in on the TEAC UD-501. I just got this unit to test it out with Linux and MPD. I have been using MPD for years and really love the audio listening paradigm it supports. In short, this DAC seems to have some problems with USB and Linux. You can get it to play out of the box, but (on pcm) when you change sampling frequencies it borks up and has to be stopped/started again. As for DSD there is a loud pop at the beginning of each track, you can also avoid this by stopping/starting (Stop the last track before it ends then start the next track... quite manual). I'm posting to hear from anyone who might have experienced this and found a fix for their issues. Here is a gist with some of by information for debugging purposes: https://gist.github.com/storrgie/6389526

Which distribution of linux are you using? Do you let the system update with its existing package management? Do the systems remotely call home and update themselves? Did you have to do anything special with the juli@ card and alsa?

I have a uDAC2 on my mpd machine right now, I have defined the output for bit perfect. It appears to play up to 176.4Khz (HRx recordings from this site) without issue. I have not been able to test 192Khz yet. It appears that MPD is resampling when I play these tracks: Technical Information: storrgie@enceladus:/proc/asound$ cat cards 0 [intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfcffc000 irq 94 1 [N2 ]: USB-Audio - NuForce µDAC 2 NuForce NuForce µDAC 2 at usb-0000:00:1d.7-6.3, full speed Here is the log: Mar 10 09:12 : playlist: play 75:"HRx/1-01 Gymnopedie No. 1-a.flac" Mar 10 09:12 : decoder_thread: clearing mixramp tags Mar 10 09:12 : decoder_control: mixramp_start = NULL Mar 10 09:12 : decoder_control: mixramp_prev_end = NULL Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : playlist: queue song 76:"HRx/1-07 Taint So-a.flac" Mar 10 09:12 : client: [1] process command "status" Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : client: [1] process command "idle" Mar 10 09:12 : client: [1] command returned 1 Mar 10 09:12 : client: [1] process command "playlistid "75"" Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : decoder: audio_format=176400:24:2, seekable=true Mar 10 09:12 : client: [1] process command "playlistid "76"" Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : client: [1] process command "playlistid "76"" Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : client: [1] process command "status" Mar 10 09:12 : output: closed plugin=alsa name="NuForce uDAC" Mar 10 09:12 : alsa: buffer: size=192..174762 time=2000..1820438 Mar 10 09:12 : alsa: period: size=96..87381 time=1000..910219 Mar 10 09:12 : alsa: default period_time = buffer_time/4 = 500000/4 = 125000 Mar 10 09:12 : alsa: buffer_size=48000 period_size=12000 Mar 10 09:12 : output: opened plugin=alsa name="NuForce uDAC" audio_format=96000:24_3:2 Mar 10 09:12 : output: converting from 176400:24:2 No protocol specified xcb_connection_has_error() returned true Mar 10 09:12 : Failed to open mixer for 'NuForce uDAC': no such mixer control: PCM Mar 10 09:12 : client: [1] command returned 0 Mar 10 09:12 : pcm: selecting samplerate converter "Fastest Sinc Interpolator" Mar 10 09:12 : pcm: setting samplerate conversion ratio to 0.54 You can see mpd tries to play with 172.4Khz, ALSA refuses so mpd resamples.