Sounds to me like the bias is out of adjustment on one of the channels.
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Thanks for the compliments.
It could be adjusted by a casual listener, but you would need to find out from Parasound where the bias adjusters are inside the amp.
The only problem that I could see that this might cause would be a slight imbalance, sonically, between the left and right channels.
I would recommend contacting Parasound customer service and asking them about it.
Hope this helps.
I don't know if you've had the cover off, but I picked up a B&K amp that was "running hot" on one side. There was nothing wrong with it at all, it was just not a Right/Left symetrical layout inside. The heat sinks and output transistors were all on the right side of the amp. The right cover was always hot and the left side was stone cold, simple as that.
Is the balance control centered on your preamp, providing equal drive to each channel of the amp?
Are you using ceiling fans that would cool the right side more than the left and or is the right side exposed to free flow of air, leaving the left side restricted?
If you look into these two things the next thing to do is check bias.