Scott,

Subs have a large, permanent magnet, one that can have a detremental effect on anything that is unshielded and prone to electromagnetic force. This includes chips, ICs, hard disk drives, floppy drives and anything else that is prone to damage from EMF. That reciever is very delicate, and just to give you an idea, tap the reciever lightly with your fingers with everything turned on and you'll hear what I'm referring to. Magnify and multiply that impact times several thousand times an hour and that's the effect of having the reciver on top of the sub. Don't make sense to risk your equipment for the sake of convenience.

Gary