OK to place amp on top of subwoofer?

The vibrations would destroy the music and your amp! Any less-than-perfect solder joints or wire connections in the amp will be effected and lead to early failure. Read the threads here on vibration control, many of us go to great lengths to decouple our gear, this would definitely be a big step in the wrong direction.

No offense to Jeff or his answer, but if a non-mechanical component ( cd player, TT, etc.... ) can't deal with vibration, it is poorly built and under-designed. If you think about all of the "vibration" that any car audio component has to deal with, it will put things into perspective rather quickly. Then think about all of the powered subs that have their amps literally mounted inside and directly attached to the cabinet.

As to whether or not i would recommend it, probably not. One could look at the benefit of "mass loading" the sub cabinet with the weight of the amp. You would also have to take into account that this would change the sound of the sub due to altering the cabinet resonances.

Bottom line: try it and see how it works. Put something ( a sheet of MDF, etc... ) on top of the sub cabinet, try some type of DAMPING footer between it and the amp and go to town with some of your favorite tunes. If you have no bad side effects and it is more convenient for you, leave it alone and enjoy. Otherwise, it's easy enough to reverse with no long term side effects. Sean
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Hi folks, Probably everyone of you know that there are speakers with built-in woofer amps AND there are active subs as well(mostly used). And my opinion is straight: If your amp is heavy enough you shouldn't worry at all and place it to even benefit to your sub. Moreover the vibrations for the large signal components have almost no impact since the amplitude is much-much lower than the signals operated.

I think Jeff is right on. A sub would somewhere between "most likely and surely" raise hell with the musical character of the standard amp for sure-- and possibly the sub too. It even makes me shudder to think about it. Steve McCormack and many others have gone to great lengths to reduce, minimize, or eliminate amplifier vibrations.

Yet I understand what Sean is saying too, ie setting a well built amp on a sub probably wouldn't physically damage either one. Still, doing it would make me a nervous wreck, and I'd go to great lengths to find another way.

Just re-read what I said above-- makes me sound like a bleeping authority, but Sean KNOWS that I have a great deal of respect for his technical expertise, and his writings here on the 'Gon. GOOD LUCK. Craig