Amp Motor

When I turn on my amp car when the van is running you can hear the motor running through the subwoofer WHY?
If it does not work, there is no Hum. Pioneer deck, Punch 100 amp is the amp toggle switch turned on. I have many systems installed this same way and never had this problem. I thought it Amp was the ground, but I was drawn to the frame and it's the same thing. Why? Thank you!
It could be even the floor. make sure you have a good Ground from the battery to the chassis, separate from the one that goes to the engine. Ground do not rely enough on the factory chassis. It could also provide a poor amplifier Performance, internal filter capacitors can be bad go / no go, so the noise through.
dc motor power-op-amp speed controller
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