That slight hum you hear is probley interference. Everyone says its ether a ground loop or a audio cable is near a power wire. I tested the power wire near audio line and it gives alot of hum. My carcomputer and amp used to give a light hum and a louder hum when the car was running with no audio playin. And I checked and rerouted the audio lines and it fixed the problem completly. I heard its due to the reduced voltage during the car being off (ie less hum) then when you start and rev your engine your alt give off some interference and the voltage also increases causeing more hum. I would suggest trying the system with the audio lines not run or hidden under the floor but being held up and see if that fixes ur problem.



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