hey i just bought my car and i was just wondering... when i have my music going i can here the something coming in the speakers no music tho lol. rev the car and it gets louder and faster

anybody know what that mite be?

 

I don't even have my RX-7 in my possesion yet, but I'm pretty sure that what you're hearing is interfernce from the engine in the speakers. It's normaly due to wires being run badly and too close to the engine. I think you can fix it by using a metal plate as a EM(p?) sheild.

Basicaly what's happening is each time a spark plug fires, the pulse of current creates a magnetic field, when that magnetic field passes over your sound system wires, it then creates a current in those wires it has passed through. That current change is then interperated as a signal, and turned into sound at the speakers. The reason it changes with the RPM is that as RPM increases, the plugs fire in quicker succesion, changing the timing of the magnetic pulses and hence the rate of the signal change going to your speakers.

Sorry for the overly explained answer, but I'm just happy I know the answer to something. Although I'm not sure a metal shield will fix it, I think it's worth a shot if no one countermands what I said with their (probably better) knowledge.

 

id say you have the problem of a bad ground wire. Tear your dash appart and investigate!

 

Check your plug wires, if they were say a strictly racing wire then they (most likely) don't have insulation to precent the RF interference. Plus if you have 20yr old plug wires it might be a good time to change em out.

Other then that if you have a more aftermarket system running RCA's your setup might be creating some unwanted noise. If you elaborate on your audio setup that might help.

 

ok well this is what i think it mite be.... the alternator... i donno why or even if most of this **** needs to be fixed or the kid before me just sucks at putting **** in....

tomrow when i get home i well go and look if its newer wires or 20 years old

thanks for the help.