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Bavarian Soundwerks' Mobile Electronics Forum
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Old 03-02-2003, 01:49 PM   #1
dt32569
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Rewiring my system as we speak - help with noise?? PLEASE!!Ideas?

Ok guys - I am in the garage redoing my stereo vs throwing it in the gulf of Mexico...but I have run across a noise problem.

slight whine in the right channel - increases with RPMs.

OK..troubleshooting.
Running a Kenwood Head unit with internal amp turned off and RCA outs to a JL audio 4 ch amp - running a front stage and subs.

Amp OFF - NO NOISE
Amp ON - RCAs disconnected - NO NOISE
Amp ON - RIGHT CH RCA disconnected (left ch connected) NO NOISE

Head Unit - grounded to stock BMW wire - NOISE
Head unit - ground wire run back to battery Chasiis ground - NOISE

Ok - so I am thinking RCA cables? Check this out - switched cables - sub cable to front input, vice versa - again same as above - noise ONLY in the right channel - so the cable itself I thought was bad may not be???

QUESTION - sound like the cables (run together near the remote turn on wire) are picking up noise? They are 6 yr old Phoenix Gold RCAs - maybe I need low noise ones huh? WHY only the right channel?????

Thanks for inputs!! I wanna get this done ASAP!

Last edited by dt32569; 03-02-2003 at 01:54 PM.
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Old 03-02-2003, 07:16 PM   #2
visor
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Some suggestions: Make sure your signal wires are well away from the power wires. Also avoid running the power wires against the chassis of the amp.
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Old 03-02-2003, 08:39 PM   #3
dt32569
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k...

Powers wires are not near the chassis - the RCA wires are away from any power wires EXCEPT they run along the floor with the remote turn on wire. Think thats it? Thanks for the ideas!
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Old 03-03-2003, 11:03 PM   #4
hp2025
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Switch the RCA channels, left to right, right to left. If noise switched from right to left, then you know is between amp input to headunit .
If noise still there, try connecting factory speaker with a short speaker wires on right channel of amp, if no noise, then is between amp and speakers. If noise, then it is between Amp and Headunit.

Then take headunit out and bring it to the trunk, connect REM and B+ to battery +, and ground to battery -, hook RCA to amp and try again.
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Old 03-03-2003, 11:30 PM   #5
dt32569
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Did some of that

I switched the channels....noise in RIGHT speaker still
I pulled the head unit out and moved it away from the dash - but didnt hook up the + to the battery - an idea. Also the Speaker is a good idea....darn.....that would tell me if its RCA wires OR noise on the + lead coming into the HU.
THANKS!!!!!
That should reveal the problem! MUCHO APPRECIATO!
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Old 03-11-2003, 01:37 AM   #6
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dt32569, hp2025 probably gave you the right steps to eliminate the problem, but also try:

1) make sure your RCA are high-quality and SHIELDED -- something like the Monster XLNs.

2) I'm not quite following where your ground wire is going, but try not to run it right next to the power wire, and preferably perpendicular to it -- remember that charged wires have a field around them, and thus if they're running together, the field interaction is causing noise.

3) You don't have to run the ground wire back to the battery, just find one of the factory grounding blocks as close as you can to your amp -- there's one on each side of the trunk on the fender walls -- they're a cluster of brown wires.
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Old 03-11-2003, 01:41 AM   #7
AIYA
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check the white remote turn on wire. I had noise once in my system, until i use that white wire to turn on and off my amp.
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