dunit2350 Posted April 14, 2008 Share Posted April 14, 2008 So I just got a stereo installed in my car (aftermarket sub and amp with the factory deck) and I have noticed ever since when I accelerate it makes a noise like air is coming into the car (Kind of like the heat/ac is being turned on, but no air is coming out). I have absolutely NO idea what the hell it is… any ideas? Keep in mind I never noticed it before I got my stereo installed. Thanks. Link to comment Share on other sites More sharing options...
atouk Posted April 14, 2008 Share Posted April 14, 2008 Did the install involve running a power line through the firewall? If so, maybe they didn't re-seal it well and you're hearing the result of some missing sound insulation. Link to comment Share on other sites More sharing options...
700watts Posted April 14, 2008 Share Posted April 14, 2008 more than likely alternator noise Link to comment Share on other sites More sharing options...
dunit2350 Posted April 14, 2008 Author Share Posted April 14, 2008 Did the install involve running a power line through the firewall? If so, maybe they didn't re-seal it well and you're hearing the result of some missing sound insulation. Yeah good point. They usually have to do that for every install.. How should i go about seeing if thats the problem? Lifetime warranty on install but the place is like 45 mins away from my house. Link to comment Share on other sites More sharing options...
fweasel Posted April 14, 2008 Share Posted April 14, 2008 gut tells me its a poor ground. Does the noise go away when the stereo is turned off? If so, that rules out the actual "air noise" theory. ignore him, he'll go away. Link to comment Share on other sites More sharing options...
ejoy1220 Posted April 14, 2008 Share Posted April 14, 2008 Sounds like you need a ground loop isolator inline somewhere, or to redo the grounds. Link to comment Share on other sites More sharing options...
dunit2350 Posted April 14, 2008 Author Share Posted April 14, 2008 gut tells me its a poor ground. Does the noise go away when the stereo is turned off? If so, that rules out the actual "air noise" theory. No it does not go away when the stereo is turned off.. thats how i noticed it.. The setup i have is a a hi-ref x800 amp image dynamics 12 and then i got a mempis audo controller. I might just give them a call to see whats up.... Link to comment Share on other sites More sharing options...
dunit2350 Posted April 14, 2008 Author Share Posted April 14, 2008 He said its most likely the signal wires and the altornator, but they told me to come by when i get a chance and they would take care of me. Thanks for your help. Link to comment Share on other sites More sharing options...
fweasel Posted April 15, 2008 Share Posted April 15, 2008 Well, if the system is off, a ground hum coming through the signal wires shouldn't matter. Although the most likely explanation is that there is indeed a ground issue, it should go away when the system is turned off. That brings up a second problem, IMO, which is that your aftermarket amp is not turning off when the headunit is turned off. They likely used an ignition switched 12V source for the amp turn-on when they should have used something switched by the OEM headunit like the antenna amp trigger. ignore him, he'll go away. Link to comment Share on other sites More sharing options...
SuperCleanLGT Posted April 15, 2008 Share Posted April 15, 2008 Well, if the system is off, a ground hum coming through the signal wires shouldn't matter. Although the most likely explanation is that there is indeed a ground issue, it should go away when the system is turned off. That brings up a second problem, IMO, which is that your aftermarket amp is not turning off when the headunit is turned off. They likely used an ignition switched 12V source for the amp turn-on when they should have used something switched by the OEM headunit like the antenna amp trigger. I think you hit the nail on the head Link to comment Share on other sites More sharing options...
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