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Old 05-17-2013, 02:36 PM   #1
Rich L
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Join Date: May 2013
Location: UK
Posts: 4
My Ride: E46 Compact 320td
Whine on one tweeter after speaker install

One for electrical/audio install experts...

I've replaced the oem speakers in my Compact with some Focals. I've now got a bit of alternator whine, on one (drivers side) tweeter only. No problem on the other tweeter or either woofer. It increases when the side lights are switched on, and increases again when going to headlights.

I've also noticed that I get a buzz from this tweeter with engine OFF (again increasing going from side to head lights) but the lights switched on (again increasing going from side to head lights). I've switched the wiring so that the driver's side speakers are fed by passenger side channel from the head unit - problem stayed with the drivers side. Switching the HU on/off makes no difference to the degree of noise. Twiddling the instrument dimmer has no effect.

My wiring from the crossover (mounted behind glove box) passes pretty close to the light switches (and maybe tie-wrapped to the lighting cabling thinking about it now), and from the above this proximity and consequent induced noise looks likely to be the culprit. I'll trying some re-routing of course, but even then, the tweeter (I've maintained factory location in the mirror sail) is pretty close to the light switch anyway so don't yet know if this will help.

Does anyone know if shielded cabling can sort this, or can the lighting circuit have some sort of suppressor added (or any other possible solutions)?
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Old 05-17-2013, 11:03 PM   #2
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Join Date: Feb 2013
Location: california
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My Ride: 330i
Re: Whine on one tweeter after speaker install

I would pull the crossover away from the wires to see if it fixes the problem. If so relocate the xover

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Old 05-18-2013, 09:56 PM   #3
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Join Date: Oct 2012
Location: Dayton, Ohio
Posts: 220
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Like you said there are quite a bit of electrical equipment behind the glovebox and can almost guarantee that's your issue. Try to put your crossover out in the open and see if it continues.
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