Most speakers are shielded, as are amps.
The only issue (considering the prevalence of non-CRT monitors) would be the hard drive, which is pretty well protected anyways.
In short I wouldn't worry about it.
Ich habe einen Kenwood KA-4006 Amp, den ich an mein MacBook angeschlossen habe.
Ich weiß, dass Lautsprecher Magnete enthalten. Ich wollte nur verifizieren, dass sich im Verstärker keine Magneten befinden, die meinen Mac durcheinanderbringen. Muss ich mir Sorgen machen, dass mein Computer den Lautsprechern zu nahe kommt?
Most speakers are shielded, as are amps.
The only issue (considering the prevalence of non-CRT monitors) would be the hard drive, which is pretty well protected anyways.
In short I wouldn't worry about it.
I keep my laptop half the time on top of two big Wharfendale speakers. In the last ten years nothing happened.
Yes, speakers are bad - in theory many things could happen. In practice computers as a whole, nowadays are not so sensitive, nor the parts in them.
So, go by the principle: "Did something happen so far ?" ... "No?" ... "Good, then probably I have nothing to worry about!" :-)