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Car Stereo noise (Not Audi specific)
I have a 4000Q, and I installed a high power separate component stereo
system. The system works great, but there is a whine in the back
speakers, that is related to engine speed.
I have a head unit in the dash, CD changer in the glove box, one amp
in the trunk, and another under the rear seat back rest. I have two
6x9 full range speakers and two 10" subwoofers in the rear dash, which
I made custom out of a piece of plywood. I have speakers in the front
dash and in the front doors. These are Infinity Kappa Series with
their own passive crossover. So I have eight speakers all together.
Oh, I have a active cross over in the trunk that splits the rear
channel between rear full range speakers and subwoofers.
I experimented with different locations for the ground connections
with each of the components, with varying degrees of success. I
conducted "experiments" by running wires over the carpeting to the
locations to be tested. At one point I found a configuration that
gave me a noticeable reduction in noise, so I went to "hardwire" it
(install permanently with the wires under the carpets), and when I
finished, then it was noisy again!!! Urgh!!!!
Anyway, most recently, I replaced my US spec headlights with some high
powered Euro units which I wired right to the alternator hot lead (I
use relays to activate the lights), and I noticed a change in loudness
of my stereo whine when I switch from high to low beam. I know my new
lights draw more current, and that, perhaps combined with where I
attached the power lead, could be affecting this.
So, I guess my question is, does anyone have any ideas? How about
those capacitors you can buy at Radio Shack that you put on your
alternator to reduce whine? I haven't tried one yet, but I wonder if
anyone has any experience with them. Does anyone know of an internet
group like this one for car audio enthusiasts to whom I might present
I theorize that I have a ground loop problem, although the noise
source is probably still the alternator. A buddy of mine once
mentioned that grounding a car stereo is more of an art than a
science. Does he have a point here? Maybe I should just keep
experimenting, and not give up, but it is certainly frustrating!!!
Thanks in advance to anyone who can offer me any suggestions. I am
kinda at the end of my rope (er uh, is it my wire?).