Whining sound thru speakers when amp fan kicks on

[Heavyhitter1k]

I have a kicker 750.4 running 2 comp sets per door. Everything is fine and sounds great until the amp gets warm and the fan inside kicks on. When this happens, I get a faint hum or whine thru the speakers.

Is there anyway to fix this? Besides turning it up and drowning it out? Its not alternator noise because it only happens when the fan on the amplifier turns on.

Thanks