never stack anything on top of a power amplifier; not without additional cooling. I'm kind of surprised that someone hasn't mentioned things like electromagnetic pulses when you turn on something like an amplifier. this would never be a good thing for a vcr for example. even supposedly shielded toroidal transformers can have an initial pulse at start-up. another example would be having a power amp near a CRT-based television, etc.

ultimately, heat is the enemy. anything you can do to mitigate heat for a component is "a good thing" (sorry, Martha!)

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no 3-wish limit