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From digest.v7.n15 Mon Jul 28 17:55:15 1997
From: Dean.Schreier_at_pscmail.ps.net
Date: Mon, 28 Jul 1997 10:06:00 -0500
Subject: Re: <E36> <M3> ...ignition noise on stereo
<M2260753.008.1dy39.1.970728160353Z.CC-MAIL*/O=CCMAIL/PRMD=PSC/ADMD=MCI/C=US
/_at_MHS>
Kirk,
If your stereo has a whine it is alternator noise, if it has a tick,
tick sound it's ignition noise. And eliminating it can be a job best
left to a professional. Systems that use line level convertors are
some of the biggest culprits/receivers of outside noise. Car stereo
shops that are good at removing noise will have a "sniffer" (basically
a tape recorder with the tape head on a long wire and some headphones)
which enables the installer to find the point (or points) at which the
noise enters the system (at lot less trial and error by doing it this
way).
I really don't have enough information to help you. I need to know
where you put the convertor (at the amp or at the radio). What
crossover and amps and convertor are you using (some are not shielded
as well as others...especially crossovers). Where the amp(s) and
crossover are mounting, how you routed the wires???
I can give this generic advice:
1. The line level convertor should be at the radio and shielded cables
should be run from the dash to the crossover and amps. The cables
should run away from the factory wiring harness (as much as possible).
2. You could try moving the grounds for the equipment around. Try all
(including the radio) at one point, near the amps. Don't ground
directly to the battery terminal. Sometimes just the right combination
of grounding tricks will eliminate the noise. (but probably not in
your situation).
3. Try adjusting the gains on the amps and crossover to minimize the
volume of the whine (this is not a solution, but it can help in
situations where the noise is minimal).
Help this helps,
Dean (not an installer anymore...9 years of previous experience)
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