A question about my speaker and amp wiring?

Question

Tonight, I set up my rockford fosgate amplifier and my infinity speakers. I wired it all up and everything and turned them on. I put my car in the "on" position without starting it. The amp powered on and the speakers sounded amazing. Then i started the car... The speakers still sounded really good, but I could hear a slight whining noise. Then when I was driving, the faster I went, the higher pitched and louder the sound got, and vice a versa. I checked the wiring an it is all correct. Any suggestions, or does any body know why it is doing this?

Answer 1

Yeah, ground-loop isolate that little problem away ;-) it won't change pitch with your physical speed, just engine speed.

Answer 2

Alan L needs to stop giving advice since he doesn't know what he is talking about. If your amp was not grounded properly your amp would go into protection mode and turn off. You need a ground loop isolator, since what your hearing is called engine whine. Noise from the alternator is coming through your stereo and out of your speakers. Go to any audio shop and pick one up, doesn't matter about brand or anything because all that they are is some resistors. Take your RCA cables out from the amp and plug them into the isolator, then plug the RCA end on the isolator into your amp, noise is gone and your done.

Answer 3

I would skip the loop isolator if it is possible. It's really a last resort type of item.

Make sure that the preamp cables and the power cable aren't routed too close together. They should really be on opposite sides of the vehicle.

Another thing, making sure that the grounds are good is never a bad idea.

Answer 4

make sure all power sources are connected well. Use factory connections for deck if possable. If possable use shielded  patch cable for rca connections. Check that ground is properly connected and a foot and a half long at most if possable. May have to try alternate power sources if still present. Check equipment one at a time if possable.

Answer 5

You need to ground your amp better.

Answer 6

the second guy seems to know whats up, I was going to tell you to check that you didnt get too near any live wires, the em field causes that, but ya im guessing his little doohickey will do it much easyer