Dear Community,

I've been using piCore Player on a new Pi 2 model B, taking data via
wired ethernet and feeding a Marantz SA8005. Everything works great via
hifiberry digi+ w/ toslink, through 24/192.  I have trouble using the
coax spdif, w/ no sound when using a wall wart and some sound but w/
dropouts using a Jerome linear power supply I used to use for my Touch,
so I guess the coax issue is power-related but anyway that's not why I'm
writing.

When using USB, I occasionally get a horrific loud continuous
white-noisy kind of continuous hissing static. Sometimes I can tell when
it's about to start - the music starts to "tear" or "spit" and I know
"oh crap here it comes".

Sometime it plays OK for hours but I never know when I'll get blasted.

I've tried a few different USB cables -no difference. The static seems
to happen more frequently when I switch tracks. Happens on 16/44 w/ or
w/out upsampling as well as w/ higher-rez either upsampled or not.

Thinking this may be a buffering issue I added buffering to the Buffer
Size Settings tab (tried 40000:4000,  I think). I thought this fixed it
but then it came back.

I noticed that when I turned the volume all the way to 0, via a Duet
controller, that the hissing stopped, and came back full volume when the
volume was set to 1 out of 100%. Sometimes I hear music playing through
the static and even at volume level 1 out ouf 100% this music plays at
full volume. Thinking that the whole static issue is somehow related to
the volume control I disabled it but the static still comes back.

So I don't use the USB anymore which means no DSD. 

I'm left thinking that this may be a quirk of the Marantz, where it
sometimes loses the USB connection and responds with a full-volume blast
of white noise. Very unpleasant as you can imagine.

Any ideas? Any hints? Better yet any solutions? I installed the piCore
2.0 and same problem.

One thing I didn't try was to remove the digi+ to see if it has any
impact on the USB.

I'll try to borrow another USB dac so I can check out this issue and the
coax issue as well.

Thanks in advance for any assistance! (although my setup does still
sound great through the toslik!)

-Mike


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