massivewangers Posted March 10, 2010 Share Posted March 10, 2010 Just put a bit of stereo in my car, nothing amazing yet, just a CD/MP3 tuner, a set of components in the front doors with tweeters in the A-pillars, running off an amp mounted in the boot. It seems when the engine is running I'm getting some feedback, mainly through the tweeters. I'm no expert on car audio to be honest, it isn't really my thing, but what could be causing this? Currently the main power cable runs down the left hand side of the car to the boot, along with the remote lead from the head unit. Down the right hand side are the RCA leads and the cables running from the amp to the crossovers. Can any of this not run together? Or is it likely to be an earthing a problem? Feedback is associated with engine revs; the level changes with engine revs. Just a list of things to check would be handy, cos I have no idea about this sort of thing if I'm honest! Link to comment Share on other sites More sharing options...
ganges Posted March 10, 2010 Share Posted March 10, 2010 now dont quote me on this just a suggestion, I think you made need a inline suppressor which any car ice place should have and will tell you where to put it, i am going back to the old days if memory serves correct it basically looks like a plastic fuse holder, hope that helps Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2010 Share Posted March 10, 2010 This isn't feedback., it's just noise/inteference. It's caused by noise from the alternator and coilpack typically. Ensure both of these have the appropriate supressors installed. Link to comment Share on other sites More sharing options...
massivewangers Posted March 10, 2010 Author Share Posted March 10, 2010 This isn't feedback., it's just noise/inteference. It's caused by noise from the alternator and coilpack typically. Ensure both of these have the appropriate supressors installed. Where would I find those Stu? There was no issues with the original system that I ever noticed, it's only happened since the change! Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2010 Share Posted March 10, 2010 Unplug the head unit RCA's from the amp and see if you still get the noise. If you do then it's related to the amp power supply, if you dont its coming from the head unit or rca's.. Link to comment Share on other sites More sharing options...
massivewangers Posted March 10, 2010 Author Share Posted March 10, 2010 Just tried this and when you unplug the RCAs it goes away... Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2010 Share Posted March 10, 2010 Have you hooked up all the earth connections for the head unit? Link to comment Share on other sites More sharing options...
massivewangers Posted March 10, 2010 Author Share Posted March 10, 2010 I thought it only had the single earth that ran through the ISO connector into the car's loom? Obviously that's connected. The wire in the ISO adaptor loom was partially stripped as something else had been earthed to it too (I don't remember what). It's the unit that came from the black 2.0 anyway, just running without the processor unit. I thought there was only the one earth required for the head unit? Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2010 Share Posted March 10, 2010 I have no idea to be honest, can't even remember the model number now! Link to comment Share on other sites More sharing options...
massivewangers Posted March 10, 2010 Author Share Posted March 10, 2010 It's a......CDA-9884R. Not sure if that will help massively. I could try adding an additional earth I suppose. Someone else I suggested I try that. Just take it from the section where it was stripped and reinsulate it. But I thought it would only need the existing earth really! Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2010 Share Posted March 10, 2010 I think the first priority is to ensure all the wiring from the HU is proper. Link to comment Share on other sites More sharing options...
massivewangers Posted March 10, 2010 Author Share Posted March 10, 2010 The head unit wiring seems ok. I also tried an extra ground but that didn't seem to make any odds to things really, though I may try it again just in case the earth point I had wasn't amazing. A couple of other people have also mentioned fitting something to try and reduce interference from the alternator. Just seems strange when I've had two cars of the exact same model as this and never had an issue like this before! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now