I owned the 400cx and now own the EVO 402 and have never heard a peep out of either amp. I listen to all kinds of music, leave the amp on all the time, listen loud, listen soft, listen to the TV/dvd (sometimes, opera mostly).
Those amps have never done anything but make music. My listening room can get warm or be cool so I am surprised that my experience is different from many on the list.
Those amps have never done anything but make music. My listening room can get warm or be cool so I am surprised that my experience is different from many on the list.