10-22-2018, 03:04 PM
(10-22-2018, 08:43 AM)motkawa Wrote: Hi Tim,
thank ou for your reply, I completely agree with you, and I don't really have any explanation. I try a lower Analog gain boost and analog gain, it's better, but still not perfect and it's not what recommend IQaudio.
I try to do some test sound directly with mplayer using only raspbian properly parameterized with alsa at 0 dB and the gain set as defined by IQaudio in the manual, and that works.
Finnaly driving by curiosity I try Volumio, and everything is fine.
I haven't have time to check from where it comes, but too me it could be due to a different version of MPD or ALSA (?).
It's very strange.
When I check with alsamixer it's the same settings but obviously that sound different. (not different in audiophile terms ;-) ) Different such as one is OK and the other one make your ears bleeding due to the distortion.
@motkawa
I read the current IQaudIO User Guide v27 and its instructions for moOde setup.
The pdf file-date reported on their website is 2017-09-10. This predates the release of moOde r4.0 based on Raspbian Stretch. Have you asked IQaudIO for an explanation of the instruction "Within the same selection make sure you set the volume to around 20% (not 100%) and press SET"? What's their advice for moOde r4.x?
Regards,
Kent
PS - have you compared the outputs for the two systems from dmesg, lsmod, and aplay -l to see if your moOde and Volumio setups with the IQaudIO Pi-DAC Pro are exercising the same low-level kernel modules?
