clipping / distortion on 100 volume and IQaudio DAC+

jonas18z

Anyone else has problem with clipping/ distortion on when volume is set to 100 with IQaudio DAC+?

around 95 is fine.

KHatfull

Try logging into the box via Putty/SSH and run alsamixer. See where the gain for the Pi-DAC+ is set, make sure it's not above 0db.

While you're there you could reduce the gain -3db from wherever it is which should solve your issue at 100% volume in RA.

However, I find that after a powercycle I have to reset the gain in alsamixer to where I want it, it doesn't seem to stick.

jonas18z

I attached a screenshot.

I don't understand:

Item: PCM [dB gain: 0.01]
And there is two value on the green/white bar 86 and 00

Is this bug under progress, I don't find it on github?

Attachments

: Skärmavbild 2015-01-18 kl. 14.31.07.png (63.06 KiB) Viewed 2517 times

ACX

Please have a look at our future plans to improve that behaviour:
#254
and in particular at Gordon's post (IQaudIO's owner), where he explains the DAC's range:
#2547

jonas18z

Thanks!