HI guys, I have tried searching for this problem but can't find the answer so here I am. I had recently installed an amp (boss audio chaos rev455) to power my front door speakers and tweeters (power acoustik nb-4). I put the amp in the trunk, because it wouldnt fit under the front seats and ran the rca's and the speaker wire along the passenger side of the car and power wire and remote down the drivers side. When i start the car i get this quiet very fast intermitten noise out of the tweeters. The sound does not increase with rpms, or volume, it stays constant and cannot be heard in the door speakers. Also the speakers that are connected to this amp pop when i shut the car off. I have the grounds for that amp and my subwoofer amp on different bolts but same piece of metal, could that be causing it? I also read somewhere that sparks plugs and wires could be causing this, which the sound reminds me of a spark plug firing, but all the plugs and wires have been replaced and are on tight but if it was the spark plugs the sound would get faster with rpms i would think. Anyone got any ideas what this could be? I have inserted a link to get the manual for the amp if you need more info on it. Thanks

http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=man

Sounds like you have a ground issue. Did you increase your grounds or done the big 3?

Yes I have done the big 3 and the only new ground is for the rev455, it has been sanded amd makes a solid connection, but is grounded on the same same metal as the sub amp but under a different bolt.

If the car is off, but stereo on, does it still make the noise?

Does adjusting the volume have any effect?

Ok so after getting off work tonight I looked into it more, and what i found is that it does increase with volume but not til 32 and it maxes out at 35 (i dont normally turn it up past 25), it does get very slighty louder when i rev the car up. The sound is not present while the car is off, and when the hu is in standby. Also I have the hu grounded to the factory ground on the audio wiring harness, and after thinking about it, Im thinking that could be the problem and if not it couldnt hurt to ground it somewhere else. Now is the metal that runs along side the radio compartment a good place to ground it, it runs to the floor so that should be ok, right?

Does it go away if you decrease the gain? That amp will be suceptible to exposing thermal noise when the gain is up. That shouldn't be intermiddent but if you remove that from your description it sounds likely.

yep it was the gain it was only up about a 1/3 of the way so i turned it almost all the way down and faded it to the front more and its like it was but no noise. Didnt think of the gain since it wasnt turned up that high. Thanks to all who took the time to help me out, much appreciated.

All amps are susceptible to thermal noise, ones that are made cheaply even more so.