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Static noise with M3 on SACD only

post #1 of 8
11/5/05 at 2:12am
Thread Starter 
Very strange thing. When I play SACD there is background static noise. Its only on SACD and M3 head amp. I have Denon 3910, cables connected to M3 and from head amp to ROTEL RSP-1066. It happens only on SACD layer. If I switch to CD layer noise is gone. When I change headamp to PPA or PIMETA- no noise at all. If output M3 cables are disconnected - no noise. If ROTEL is on any other mode than standby - no noise. I tryed many headphones and still the same story.

Any idea what can couse this problem?
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post #2 of 8
11/5/05 at 2:13am
Maybe it's in the recording.
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post #3 of 8
11/5/05 at 2:39am
Thread Starter 
Quote:
Originally Posted by Twombly
Maybe it's in the recording.

I've checked few SACD's and it's on all of them.
Maybe it's some kind of loop - sacd player (2ch. analog) > headamp > receiver > sacd player(5.1 analog connection). It I brake it, the noise is gone.

But why it's only on SACD layer and M3 ? that's the bid mystery......
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post #4 of 8
11/5/05 at 6:38pm
your M3 is most likely oscillating, because it can't handle the ultrasonic crap which your SACD player emmits.. try different opamps, better decoupling, perhaps lowpass the incomming signal or compensate the loop..
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post #5 of 8
11/5/05 at 7:15pm
interesting thought glassman - qkizz: what opamps are you using?
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post #6 of 8
11/6/05 at 1:36pm
Thread Starter 
I'm using AD8610AR.
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post #7 of 8
11/6/05 at 3:41pm
Thread Starter 
Quote:
Originally Posted by Glassman
your M3 is most likely oscillating, because it can't handle the ultrasonic crap which your SACD player emmits.. try different opamps, better decoupling, perhaps lowpass the incomming signal or compensate the loop..
Thanks Glassman for explanation. I'll try to solve it somehow. It would be much easier if I understand what are you talking about.

"better decoupling, perhaps lowpass the incomming signal or compensate the loop"

How can I do it?

Thanks
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post #8 of 8
11/6/05 at 6:13pm
start with putting a small cap across the feedback resistors (or increase their value if they're already present).. I'm not familiar with m^3 so sorry, no part numbers..
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