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In Reply to: RE: How will efficient speakers/amp on batteries compare? posted by ggking7 on March 17, 2012 at 15:39:09
I'd suspect temperature, not just line noise. The Magnepan may have low resistance at DC. This can make the amp heat up from it's DC offset and lead to distortion. If you cap couple the amp to the speakers, the problem may go away. You can measure the dc offset out of the amp (both channels) at various points during the day to check.
I've seen a Bryston use as an industrial amplifier. The load was close to 4 ohms ac, but it less than 1/10 of that at dc. The amp had problems because its DC offset varied with temperature and into a low impedance DC load, the DC offset would cause the amp to overheat. The fix was to cap couple the amp to the load.
Try cap coupling through a series pair large (~>10,000uF each) aluminum caps with the + terminals tied together with the Bryson amp going in one - terminal and the speaker to the other - terminal. Place a diode across each cap (Cathode (band) to the + terminal of the cap.)
Note: This type of load (4 ohm at audio and a low impedance at DC) is a challenge for any direct coupled amp. They were using a Bryston because their McIntosh tube amp finally died and they couldn't afford another McIntosh with a transformer output.
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.
Follow Ups:
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.
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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