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davegreen

posted on 8th Feb 17 at 06:57

have you tried switch the amp on with the head unit? there should be a remote trigger (usually a blue wire) on the head unit.
could be picking up noise from the cigarette lighter.
so its a BMW mini? not an Austin Mini which did need noise suppression on coil pack, distributor and alternator/dynamo's.


kz

posted on 7th Feb 17 at 21:39

quote:
Originally posted by pow
https://www.amazon.co.uk/AV-Link-Ground-Loop-Isolator/dp/B000NVWB9O


I bought one of these, and yes it does work, to a point. It badly suppresses the subwoofer, rending it almost useless.

quote:
Originally posted by davegreen
what car is it in?
cable routing could cause the fault if rca's run to close to a power lead.
even if the trigger for amp runs with rca it can cause noise.
you could also try a noise suppressor capacitor on the alternator.
could also be dust inside the amp is shorting out and causing noise.


It's a MINI. Everything is completely separate. The RCAs run down the left side of the car. The remote runs from the top of the amp to the cigarette lighter in the left of the boot. The power runs down the amp to the battery underneath.

quote:
Originally posted by Ian
Is it still apparent with the amp on and the RCAs unplugged?


Not sure actually, but I found this I'm going to run through at the weekend...

https://images.crutchfieldonline.com/ImageBank/v20150824112100/learningcenter/articles/417/NoiseSuppress.pdf


davegreen

posted on 7th Feb 17 at 19:31

could be a mini cooper s not a bmw thing?


Ian

posted on 7th Feb 17 at 15:19

Is it still apparent with the amp on and the RCAs unplugged?


Steve

posted on 7th Feb 17 at 14:19

probs just hearing the supercharger lolz


pow

posted on 7th Feb 17 at 13:23

Mini Cooper S guessing by his profile


DaveyLC

posted on 7th Feb 17 at 12:33

quote:
Originally posted by davegreen
what car is it in?


Steve

posted on 7th Feb 17 at 11:50

Ecotek Power boost valve


davegreen

posted on 7th Feb 17 at 11:42

what car is it in?
cable routing could cause the fault if rca's run to close to a power lead.
even if the trigger for amp runs with rca it can cause noise.
you could also try a noise suppressor capacitor on the alternator.
could also be dust inside the amp is shorting out and causing noise.


pow

posted on 7th Feb 17 at 09:52

https://www.amazon.co.uk/AV-Link-Ground-Loop-Isolator/dp/B000NVWB9O


pow

posted on 7th Feb 17 at 09:51

Group loop isolater?


kz

posted on 7th Feb 17 at 09:21

Hi thought I sorted my interference problem today, but alas it was not to be.

So far have tried...

Two different headunits
Two different sets of RCA leads
Two different remote leads
Two different remote locations
Two different earth leads
Two different earth locations

What I get is whirring and squeaking through the speakers when the headunit is turned on. It's worse when stationary and at low speeds. I've had the same setup throughout five different cars and never had this problem before! Wondering what else I could try...

Could it be something to do with the amp being so close to the battery? This is the first car I've had with the battery in the boot.

Could it be a knackered amplifier? It is very old (15 years)

I've searched around online and most advice seems to point to earthing... but as you can see I've tried various different things there. Worth pointing out without the amplifier powered up (i.e. taking the fuse out) the sound system is perfect.