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BPR
X-TRAIL NEWBIE
Date Registered: 03-2009
TOTAL POSTS: 23
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amp install - alternator whine/constant humm
hey guys, this might be a one for rich.
i have spent the last two weeks installing myself a new sound system. just the headunit, front 6" clarion splits and rear 6" 2ways and amp, (subs coming later)
it was all going smoothly untill the car turns on, i get a really high pitched alternator whine and constant humm coming through the speakers, very very very annoying!!
i have tryed everything i can think of, (and yes the rca's run down the passanger side and the power cable is running down the drivers side)
i have sawped cables, tryed new rca, tryed 4 different earths, noise filters, and also different amps.
help!!
Last edited by BPR, 7/Jan/2010, 3:37 pm
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Brenton - 2005 S2 STX Auto
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7/Jan/2010, 1:32 pm
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basshead
X-TRAIL HOLIC
Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: amp install - alternator whine/constant humm
Hey Brenton,
I hate alternator whine with a vengeance, and those noise filters are really only a band-aid fix - better to solve the problem than try to conceal it...
I had alternator whine in one of my previous cars (no, not the Pulsar, Jalal  ), and it turned out I'd run the RCA leads near the factory wiring loom where it passed over the rear wheel arch. The interesting thing was that the only thing I'd changed was from an Alpine "Flex" series amplifier to a "V12" series amplifer - using all existing cabling, so you could understand my thinking that the new amplifer was at fault! Alpine's response was that the V12 amplifier was higher quality and more sensitive to noise (?!). The way I found out the problem was to run another set of RCA leads through the cabin (in the air, across the headrests) which alleviated the problem - it was just a matter of fully removing the trim panels to reveal the factory wiring loom I hadn't seen before.
If that doesn't solve your problem, I'd be looking at trying to hook up another amplifier and see if that solves it. By the way, is the amplifier mounted next to part of the wiring loom?
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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7/Jan/2010, 8:59 pm
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BPR
X-TRAIL NEWBIE
Date Registered: 03-2009
TOTAL POSTS: 23
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Re: amp install - alternator whine/constant humm
hey rich
when i connect my ipod, its directly into the amp.
i have tryed dissconnecting the antenna, but the noise is still there,
i just quickly disconnected my girlfriends headunit and tested it on my system, and that one works perfect!, no annoying noise just music.
so i dont know what to do now, i dont think returning my headunit is an option, even tho its only 2 months old, because i dont think its covered under warranty because i installed it myself, even tho i did nothing wrong.
thanks
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Brenton - 2005 S2 STX Auto
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8/Jan/2010, 2:16 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: amp install - alternator whine/constant humm
Brenton,
When you connected the noise filter did you make sure it was a heavy duty noise filter on the output of your alternator? The filter will need to pass or handle the current rating of the alternator.
The noise is definitely alternator interference.
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8/Jan/2010, 2:38 pm
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rescue1
X-TRAIL HOLIC
Date Registered: 01-2009
TOTAL POSTS: 1384
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Re: amp install - alternator whine/constant humm
Generally a hum will be caused by an earth loop where your radio is grounded at one point, the amp at another and so on
--- Alan & Phillipa
2008 X-Trail TL White Diamond
Plumpton NSW
Our Mods
X-1112 (C)
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8/Jan/2010, 5:24 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: amp install - alternator whine/constant humm
Brenton,
THIS thread addresses your problem exactly and shows ways to overcome this issue (including the suggestion made by Alan above to have both radio and amp share the same earth point)
Last edited by jalalski, 8/Jan/2010, 5:38 pm
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8/Jan/2010, 5:38 pm
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