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In the noisy and imperfect world of car audio, proper grounding is essential
to the SQ and lifespan of your system. In this paper, I will outline proper
grounding techniques.
First of all, make sure that your ground cable(s) are the same gauge as your
power cable(s). Remember that all of the current that your amps are drawing
has to go somewhere, and that somewhere is ground.
Second, make sure that your ground wires are as short as possible.
Third, when attaching the ground cable to the ground, make sure that the
spot you choose is bare metal, not painted, and that it is connected to the
frame. Checking continuity between the ground (black) post on your battery
and the ground point you have chosen is a good idea. You should also
consider upgrading the ground from the battery to the chassis, specifically,
running a very stout wire to the firewall.
Finally, when grounding
multiple amplifiers, try to using the same ground point for each of them.
This will minimize ground-loop problems. If you have a multiple amp setup
with ground-loop interference, try moving the grounds around. This should
clear up your problem.
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