Two noises are coming from my car.

1) Every now and then my subs will thump, thump, thump constantly. The thump will be there even if I turn my stereo all the way down to 1, but will not be there if it is turned down to 0. I can also hear the constant thump while scanning through a CD.

2) I am recently hearing a whine that follows the rev. of my engine. I rev my engine, the subs whine along with it. Poor ground? I think that might be what it is, but I did ground it well.

8 guage power and ground wire, 16 guage speaker wire
Polk audio subs, cheaper but new amp


What could it be...

Your alternator might be dying...

#2 is alternator whine, are you running the power and speaker wire on the same side of the car? thats the most probably cause.. as for #1, could possibly be an intermittent ground loop.. does it change with volume, or is it a constant loudness?

"intermittent ground loop"?

it does not change with volume, it is a constant loudness... i think

The other day my voltometer showed the power dropping when I had my system on... it stopped doing it though, it only happend once.

I had the same problem it was caused by the rca wire shorting out replace the wire

Plug the power wire directly into the sub! Vishnu commands you! :hail:

Disclaimer: only a joke.



I can't say I've heard of an RCA short causing a constant thumping sound. I think they would somehow have to short into each other (the + and -) which is more likely caused by the headunit being crappy. Check the wires first and then the headunit. If everything's fine, have the amp looked at or hook up a friend's amp and see if it's the same problem.