What could be causing the noise in my car audio system?

Brad

New member
I am hearing a sound when the volume is turned down but only when the engine is running.

I have 1 power cable going from my batter to a 2 farad capacitor. The power goes from the capacitor to two amps a 400W and 600W. The capacitor and amps all have their own grounds.

I for some reason without thinking ran the RCA cables right next to the power cable and I was wondering if it is induced noise. If I have the key turned backwards (so the engine isn't running) there isn't any extra noise. Thanks in advance.
 
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