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Get better amps.
But seriously, yeah, you can leech power off your amp's power wires. The so few number of amps that the fan is drawing probably won't even affect the power going to the amp. And if your amps are overheating, they're probably not that great, which means they're not drwaing that much anyway.
And it's easy to hook up a relay to the amp turn-on lead so that the fan goes on when that's powered. I did that before and it works quite well.
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