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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-03-2002, 08:16 PM   #1
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Aftermarket radio

I just got an after market radio (avx-p7000cd/avm-p8000) installed, replaced all my speakers with MB Quarts and added 2 x 12" Matts 1000 watt Juggernaut Subs in the trunk. The subs are each powereed by their own 1100 watt Memphis amp and the radio and mb quart speakers are powered by 2 x 500 watt Memphis amps. I had all the stuff professionally installed but I am not sure if they hooked everthing up right. I get alot motor noise through the speakers. I have brought it back to the place that installed it but they keep telling me that everything is hooked up right and that this is a known problem with BMWs and Mercedes.

Does anyone else have this problem? Is there a particular way that I should tell them to hook things up?
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Old 06-03-2002, 08:21 PM   #2
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I had a similar problem on a Maxima. Someone at Crutchfield said it was alternator feedback. They sold me an alternator feedback canceller, took care of the problem. Don't know if this would help you or not. I'd suggest talking to Crutchfield or some other reputable stereo specialist. The one I got was made by PAC (Pacific Accessory Corporation) and was called an Alternator Noise Supressor (model ANS-80). May want to check down that alley.
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Old 06-04-2002, 02:32 AM   #3
hammer talks like this
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probably engine whine from the RCA's. seems like youre running lots of amps... go with that pac part... sni-1 might do the trick too.
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Old 06-04-2002, 02:36 AM   #4
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a chocked speaker wire can also give u engine noise. IMHO, there are countless possibilities for engine noise. its very hard to get to the bottom of it.
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Old 06-04-2002, 05:04 AM   #5
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bring it back...

A good shop will never let your car leave with radio noise.

A crap shop or chop shop will not take the time to care about alternator noise and they won't diagnose it in depth.

If you search on the net, you can find techniques and ways to isolate it. Search for Autosound 2000 FAQ or something ( i forgot the name of it)

Basically you need to isolate WHERE its coming from: your speakers? Your headunit? Your amp?

What i mean by WHERE its coming from is not "where you hear the noise" but what is causing the noise...

It is really tough to do all this but a few basics that may fix the problem:

1) make sure speaker cables are run on the opposite side of your car that the exhaust runs on (passenger side if your car is a BMW (since ur exhaust runs down driver side)

2) Make sure speaker wires CROSS over power wires and they don't run in parallel together

3) Get good speaker cables. If they are directional, run them in the right direction

4) GROUND GROUND GROUND! Make sure your ground cable is nice and thick (the bigger the cable the better) and make sure it is grounded well. Make sure the surface it contacts has no paint. VERY VERY common for engine noise to b caused by ground loops/bad grounding.

5) & remember: You could use a nosie filter, but like ppl say, "its just a bandaid to the problem and doesn't really fix it...just hides it"

Hope that helps
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