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Discussion Starter · #1 ·
Hi ppl,

I have installed a subwoofer in my boot but everytime i start the
engine the ignition noise in the sub is irritating, anyone knows how to
prevent this? is there anything i can install to get rid of it? thanks
 

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Have you run the RCA cables and the red and blue power cables together!!

If you have; you need to run the power cables down one side of the car

and the RCA (signal) down the other.

You are getting interference from the power leads and the RCA is picking it up.

You need to separate them as far as possible.

Hope this helps.
 

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Discussion Starter · #6 ·
Hi,

Thanks for the advice, I have separated the power cable and RCA down two sides of the car, but the ignition noise still exists.

I tried to unplug the RCA and start the engine and the noise disappear, does this meant that it is caused by the RCA? if I put the PC8 101 (see picture) in, where should I connect the other ends with black wires to? Thanks

aero
 

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It could mean that either you're head unit or amp isn't earthed
properly and is causing the interference, I know its a hard and
possibly expensive option but I'd take it to a good stereo dealer (not
halfords or the like) they will know pretty quickly whats wrong and
help you set up all the levels to get the best out of the equipment.
This is what i do, install myself setup I pay
 

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Discussion Starter · #8 ·
Thanks Bora tom,

but it only happen when you start the car after a long stop, say overnight or after
hours, then the subwoofer give a deep sound while the ignition is
turned on. apart from that, switching the engine on and off within
short time intervals doesnt have the noise problem. can anyone
figure out what is wrong.

thanks
 

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err that is odd, I presumed you had constant inetreference with the
engine on, that autoleads thing is also dsigned to surpress constant
interference.

At the end of the day you want the best quality sound and adding more things in is not the solution
 

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my mate had this problem, it turned out to be the headunit. cud be worth pluggin a mates in and see what happens..

it was like a loud thump from the subs when u start it... but again to check the earth connections 2...
 

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Discussion Starter · #11 ·
HI thanks guys,

when u said problem with head unit, do you meant the connection of the head unit? mine is stock VW Gamma head unit and the subwoofer is just plug in using ISO connection to the head unit..

Will try to relocate my earth again.. cheers
 

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aero

sounds like a ground loop problem try running the ground of the head
unit back to where you have earthed your amp in the boot just run the
wire through the car for a while and take it from ther to see if it
cures the problem
 

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Yes i did mean check the headunit as in the car stereo, but as you say this is a genuine one.

Try what Image2000uk says sounds like a good idea as maybe the earth on your headunit is corroded or somethin..
 

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Aero,

I had another thought on this are you using a good quality sheilded RCA
lead and not cheap and nasty ones normally ment for home use this can
also cause a problem ??

I didn't think the gamma had a rca preout on it though ??
 

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Discussion Starter · #15 ·
Thanks mate, I use a standard Amp cable packet from a car audio
shop. Its not pre out, you need to use an adaptor to get to the
RCA.

I have brought the car for a local audio garage and the technician told
me that he has problem with his VW as well. He said its to do
with the way VW starter and engine supply the power around the car.. I
dont quite get it though.. But he said it do no harm just a bit
annoying when the sound came up.. thanks anyway..

aero
 

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I think maplin do a supressor for ignition noise you drop it into the
supply to the radio which should solve the problem have a search on
here it was well documented as a cure for the phatnoise system

Cheers
 
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