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In Reply to: RE: I'd suspect temperature variation, not just line noise posted by VoltSecond on March 18, 2012 at 21:48:17
The same sound quality variation problem I've had with my Bryston amp I've had with Outlaw 2200 monoblocks (which stayed very cool) and Quicksilver Mid-Mono monoblocks. Exact same symptoms with each amp.
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It is also easy for power line noise to get in through the preamp.
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.. . .Oh!. . .Remember: Modifying things voids their warranty.
I actually just plug my Wavelength Proton DAC straight into the Bryston amp. Noise could definitely come in through the computer though which I suppose is the same idea. I do have the computer plugged into a Tripp Lite isolator just like the amp.
I haven't played with the Tripp Lite isolator. Some computer grade line filters improve RF noise at the expense of making audio noise worse. Others do quite well at blocking both audio and RF noise.
Try running wrapping the low level audio cables through one of these beads 3 to 5 times. Left and right should go through the center the same number of times on a stereo amp. Use separate beads for left and right if using monoblocks.
"http://search.digikey.com/us/en/products/LFB310190-000/240-2139-ND/571946"
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.. . .Oh!. . .Remember: Modifying things voids their warranty.
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