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Of course the problem is with the amps and the reason you hear it in your speakers running highs is because the whine is a high pitch whine in which your subs cannot play. You have to remember that electricity has a humming noise that is with it. So when the power from your baterry is being transfered to your amps your amps is going to try and pass that noise off as a signal. You ask why it only happens when the engine is running and why it gets louder. The answer is simple when your car is in accessorie mode it is only sending about 12volts to your amps which most amps are able to surpress but when you turn on the engine you can be sending as much as 14volts to your amps in which all of the noise is not able to be surpressed and the higher you rev the engine the more power your alternator is putting out. That is why I say use a noise filter, the noise is not hurting anything except our ears cause we have to hear it when we are not listening to the music loud. There are other things you can do like change your amps out for some high end amps that have filters built into them to handle the noise, but that's a lot of money to put out just to get rid of a noise, the other thing is try a different deck but I have had Sony, Pioneer, and JVC and had the same problem with them all. Most $20k dollar systems have the best amps on the market, the best rca's, the best decks, upgraded auto electrical system, and the best wiring and even some of them have to use filters, but that is something that you wont read or see to often. There is a lot of things that are used in car audio to be sure to get a clean sound you have to be really into it to know it. I don't think that he worried about having a competition system he just wants to be able to drive around in peace except for the music coming from his CD's or radio.
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