me and my mate reinstalled his headunit and 2 10inch subs threw an amp lastnite and all was good until we started the car and wen the revs got higher theres a whirling in the subs and got higher as the revs did.
anyone no where this interference is comin from?
__________________
1987 FE LTD
2.5 in exhuast
King Springs
16 in Chromys
Pimp Tint
are the amp power wires and the speaker wire/cables running down different sides of the car?
__________________ 91' EA II Sapphire
JMM DEV1, MPFI, Lowered King Springs, Monroe Shocks, 16" ROH Rims,CD Player, Kenwood Speakers.
Picutures HERE SOLD
I added a noise surpressor, and it fixed it right away.. I had the same problem, even after running the RCA and power leads down opposite sides of the car..
Do what EvilEA suggested, usually solves the problem in most cases. The sound your hearing is alternator noise. Sometimes the type of RCA's aren't properly shielded and can pickup this noise especially when run beside the power cable. Also, cheaper amps tend to pick up the noise more than higher end amps. If you cannot pinpoint the problem, the easiest way is to use a surpressor like yagz did....
Don't waste anymore money mate all you will need to do is find a better place to earth out either 1: your head unit or 2: your amp, the noise is alternater noise but nine times out ten it's just related to your groud wire at either end. Check them out and shift them then take the car for drive and the noise should be gone if not then go buy a supressor. With car audio fault finding you should allways start at ground or constant power wire's.
Hope this help's.
Cheer's
Nathan.
__________________
351 mate, the last of the big V8's
Grand daddy of Sport's car's
COBRA'S ROCK.
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noise in system
91' EA II Sapphire 
SOLD 
Don't waste anymore money mate all you will need to do is find a better place to earth out either 1: your head unit or 2: your amp, the noise is alternater noise but nine times out ten it's just related to your groud wire at either end. Check them out and shift them then take the car for drive and the noise should be gone if not then go buy a supressor. With car audio fault finding you should allways start at ground or constant power wire's.
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