I got a set of Polk audio db6501 and two amps. One for the components and one for my 10 in. Sub.
When the amp is off I can hear a high frequency sound coming from the tweeters. (Only when the car is started, if it's just on the ON position there is no high frequency sound) It's really annoying.
When I disconnect the tweeters from the crossovers there's no frequency sound anymore. I just find it strange that it's making this sound even when I have both the radio and amp off. It may be worth while mentioning that my sub was getting some engine feedback so I checked my ground location and there was some paint so I scrapped it off and that solved it. (I just checked my ground for my component amp and it's also on metal with no paint)
I used a set of $10 RCA's from Amazon to connect the radio to my subwoofer amp and everything sounds good, so I don't think I can contribute the high frequency sound to cheap RCA's for my components amp. (The brand of RCA is Tsunami)
Does anyone know what is causing this and how I can fix it??
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