Originally posted by brianl703:
Originally posted by cthomp21:
Never mount an amp like this. Amps generate heat which must be dissipated. It can't do this when upside down.
That would depend on the particular amp, wouldn't it? It is possible to design an amp with adequate cooling when it is mounted in any position. One way to do it is to add a fan. Another way is to design the amp so that convection cooling works equally well in both directions. Most amps have the heat producing components mounted in the sides (as opposed to the top or the bottom), probably for this very reason.
It would depend on the amp, but for the vast majority of them I'd never chance an inverted mount. You might have no problems during winter, but just think how hot the trunk gets during summer and then with all of the heat the amp generates being redirected right back into it.
I'd have no problems invert-mounting a Blaupunkt Class T amp. They run so cool that they have plastic housings.
I'm currently using a Lanzar rack amp suspended below the rear deck with about 2" above it for cooling. I could sense the power drop this summer when it got really hot outside.
Solution: Add another Lanzar rack amp. 
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