There is the answer to why there is a divergence of opinion on how hot the amps run. Parasound told me that within the parameter of the design, there is a range of bias that is acceptable, I believe within 10 degrees F. One of mine ran 9 degrees hotter, and, believe me, I could feel the difference. I had the bias lowered to be close to the other one. When it was biased hotter, you could not leave your hand on it for more than 8 seconds without feeling uncomfortable. Only 9 degrees made this much diffference. To the touch, I thought the difference was greater than 9 degrees, but I used a digital thermometer and made extensive, careful measurements, so I am sure of the temperatures.
The odd thing is that I like the way they sound in low bias nearly as much, as I use them primarily in low bias, and then don't have to worry about the heat or the electric bill!
The odd thing is that I like the way they sound in low bias nearly as much, as I use them primarily in low bias, and then don't have to worry about the heat or the electric bill!