The latter (i.e. don't worry). A foot is good + the magnetic field fm the woof would hardly be strong enough, I don't think. If you want to be super safe, place a copper sheet b/ween subwoof & amp.
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Copper will shield from electromagnetic waves, like radio transmissions and electrical noise in the air.
Mu metal is the best choice for magnetic shielding, in any case it has to be a magnetic material and copper isn't.
In general a dc magnetic field won't affect electronics, a TV CRT being the exception. The CRT involves a beam of electrons that are intended to be easily deflected so as to scan the screen. An AC field can cause Hum, but the power transformer of the equipment in question is more important than what is going on in other equipment.