Well, these amps all generate a good bit of heat (particularly the 770, 755, 7100, and 750 -- the 200's are slightly different) by their nature. If you have a couple inches of clearance above the 755 and an open front on the rack (open back wouldn't hurt either), you should have plenty of ventilation going on. It will still be warm to the touch, however. How hot is your amp getting? Are we talking about in the 90F-100F range, or are you seeing it hotter than that?

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