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Old 24-08-2006, 05:30 PM   #1
xxplosiv
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Post How do I install a noise suppressor?

Recently I've bought some 6x9 speakers to be used with my 4 channel amp (2 of the channels are bridged and go to the sub) but when I hook up the 6x9s and turn on the engine I hear a high pitched squeeling noise that goes in time to the engines revs. I told the folks at Repco and they gave me a noise suppressor, which is basiccally some kind of capacitor with a metal body and a lug coming off it, then a short wire coming out the middle of it with a fork lug on the end. How do I install this?

I'm an electrical apprentice and I asked one of the electricians at work and he said to screw the capacitor part to the chassis of the car, and join the wire that comes out with the positive wire that goes into the alternator. A few things, how do I know which wire to join it with (its pretty cramped in there) and is this even the right way? I really need some clarity on this so I can start enjoying my stereo! Any help would be greatly appreciated
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Old 24-08-2006, 06:46 PM   #2
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Doesn't that noise mean that something hasn't been grounded properly? Go back to the headunit and ensure that everything is grounded and if you're sure, add another grounding point to be doubly sure..
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Old 24-08-2006, 09:06 PM   #3
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Can be bad grounding, running the cables in a bad fashion (low voltage rca's near power is a big one). And then it could even be induced all the way from the head unit.

The way you were told to install is one way to install it. Quite often they are also installed at the coil. I've had the best results installing one at each location.
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Old 25-08-2006, 01:55 AM   #4
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make sure the amp is grounded to the chassis - It needs to be a really good connection here - make sure u sand off the paint where the ground wire connects to the chassis.

and dont run power wires and rca audio wires next to each other - keep them apart and run them down different areas of the car
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Old 25-08-2006, 11:13 AM   #5
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If you don't want to sand any paint off then take your centre console section out and earth it under one of the bolts that hold the handbrake system to the chassis. There's no paint there. There are probably other places without paint, but that's easy to get to.
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Old 25-08-2006, 11:24 AM   #6
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The problem there is that you can end up with a much longer earth run. This will mean an even larger drop in voltage supply to the amp. Voltage drop is BAD!!!
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Old 06-09-2006, 07:54 AM   #7
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I'm pretty sure everything is grounded correctly, and the power and RCA cables are sepaerate, I'll have another look tonight. If those steps have been taken, how do I go about installing this noise suppressor? How do I know which wire to break into on the alternator, etc?
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Old 06-09-2006, 10:51 AM   #8
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I would recommend installing the one you have at the coil first. The main body lug mounts onto the body (make sure it has a good clean connection), the wire connects to the positive point on the coil.
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Old 07-09-2006, 06:22 AM   #9
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can you truely recommend installing a noise supressor to a fellow forum member :ß ? i couldn't ...
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Old 07-09-2006, 06:24 PM   #10
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Yes I can. I would never recommend an in-line supressor but something that reduces noise from power sources I will recommend every day. Especially as you will find that almost all cars have some form of power line noise reducation. The type that xxplosiv is describing used to be installed in many makes and models from factory.
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