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Author Topic: feed back  (Read 1958 times)

Offline michaelnabbi

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feed back
« on: 22 February 2010, 18:26 »
i wonder if any one on here can help i have just fitted an amp and sub to my mk4 along with a double din dvd player all is sounding sweet till i rev the car up. when reved up all the door and rear quater panel speakers start to squeel these are not amped just running of the headunit any ideas to cure this would be gratefully recieved forgot to mention that door and quater panel speakers are 2ohm jbl components would this make any difference cheers mike
« Last Edit: 22 February 2010, 18:28 by michaelnabbi »
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Offline troublestarter

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Re: feed back
« Reply #1 on: 22 February 2010, 18:29 »
more than likely a bad earth
or if you have fitted an amp then have you run your rca's and speaker cables down the opposite side of the car to the power cable
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Offline michaelnabbi

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Re: feed back
« Reply #2 on: 22 February 2010, 18:51 »
i thought that it could be the earth and have drilled a new hole cleaned off all the paint and bolted it to the body so should be good there. rca's are drivers side and power passenger side only place they cross is in the boot ?
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Offline tommk3cab

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Re: feed back
« Reply #3 on: 22 February 2010, 21:32 »
Quote from: michaelnabbi on 22 February 2010, 18:51
rca's are drivers side and power passenger side only place they cross is in the boot ?


don't worry about it, you could tie them in a knot and it would still be ok power cable and speaker cables use a different kind of power, they cannot interfere with each other. Try moving them about if you want, try running them temporarily outside the car too if you want.

You could also try running an MP3 player directly into the amp using a 3.5mm-RCA cable converter.


chances are it is an earth somewhere though...... good luck!
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Offline michaelnabbi

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Re: feed back
« Reply #4 on: 22 February 2010, 23:05 »
the strange thing is it is the non amped speakers that are squeeling not the amped sub
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Offline tommk3cab

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Re: feed back
« Reply #5 on: 22 February 2010, 23:11 »
Quote from: michaelnabbi on 22 February 2010, 23:05
the strange thing is it is the non amped speakers that are squeeling not the amped sub

if the sub is low passed then it may be squealing but you might not be hearing it. It is a good sign in a way, means your filters are doing their job ;)

A way to test this would be...

Hopefully you are running full range preouts to your sub amp or can change them to full range without taking your HU out otherwise this won't work. Oh and it can't be a class D mono either but it should work on any 2/4ch.

turn the filters off on the amp or HU (or as above if you can really be bothered take the HU out and switch the RCA cables at the back of the HU from the 'sub' outputs to the 'front' outputs) then connect up any full range speaker, even a house one, to the amp but leave it at a low level. You will then be using the amp as a 'normal' amp rather than a bass amp. If you can hear the noise now then the amp is doing it but you just can't hear it through your sub :)
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