I have a phsssst noise in the rear left channel of my Marantz SR5200 AV Amp which occurs when I turn amp on. You can also hear it on some music. It sounds like a connection problem but have checked cables.
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Thermal cutoff is operating. There is excessive heat being generated on the heat sinks of the Amp. This happens when there is a shorted output transistor or a speaker load changing.
It sounds like you've read one of my many posts on 901 deployment in the AV world.
Functionally, what is the difference between one amp with 'x' channels or 'x' mono amps? Nothing. Pre-outs don't know or care what else an external amp does.
There was a time when I had two bridged-mono Carver Cube atmps (at a real 400 watts) pushing one 901 each but that was big time overkill.
I now use a Carver AV-406 (functionally the same as your MM7055) with the 901 EQ in between the AV Receiver's front pre-outs and two 110-watt channels. Other channels on the AV-406 pull subwoofer and surround back duties. My AVR directly powers only the center and surround speakers.
You have a bad amp in that channel and you need to have the unit repaired or replaced since those sharp transients can damage the more delicate speakers, the tweeters and mid range units.
Try just the power amp on ..nothing connected no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop. If there's hum with just the Adcom..then it's the ADCOM
Well, the nice thing about the newer amps is that the actual amp
circuitry is all contained in a module and you don't have to do much
troubleshooting. Just replace the module for that pair of
channels. Bad news of course is the modules can be pricey.
Should say right on it the part number, order it from mcminone.com or
whoever, solder it in, use new conductive grease (many times I think
these modules fail because the grease gets old, the module overheats
and toasts) and you should be fixya'd
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