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Author Interference on sound system...
kz
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Registered: 9th Aug 02
Location: Southend, Essex Drives: Mini Cooper S
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7th Feb 17 at 09:21   View User's Profile U2U Member Reply With Quote
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.
pow
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Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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7th Feb 17 at 09:51   View Garage View User's Profile U2U Member Reply With Quote
Group loop isolater?
pow
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Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
User status: Offline
7th Feb 17 at 09:52   View Garage View User's Profile U2U Member Reply With Quote
https://www.amazon.co.uk/AV-Link-Ground-Loop-Isolator/dp/B000NVWB9O
davegreen
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Registered: 20th May 12
Location: Oxfordshire
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7th Feb 17 at 11:42   View Garage View User's Profile U2U Member Reply With Quote
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.
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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7th Feb 17 at 11:50   View Garage View User's Profile U2U Member Reply With Quote
Ecotek Power boost valve
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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7th Feb 17 at 12:33   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by davegreen
what car is it in?
pow
Premium Member

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Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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7th Feb 17 at 13:23   View Garage View User's Profile U2U Member Reply With Quote
Mini Cooper S guessing by his profile
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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7th Feb 17 at 14:19   View Garage View User's Profile U2U Member Reply With Quote
probs just hearing the supercharger lolz
Ian
Site Administrator

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Registered: 28th Aug 99
Location: Liverpool
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7th Feb 17 at 15:19   View Garage View User's Profile U2U Member Reply With Quote
Is it still apparent with the amp on and the RCAs unplugged?
davegreen
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Registered: 20th May 12
Location: Oxfordshire
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7th Feb 17 at 19:31   View Garage View User's Profile U2U Member Reply With Quote
could be a mini cooper s not a bmw thing?
kz
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Registered: 9th Aug 02
Location: Southend, Essex Drives: Mini Cooper S
User status: Offline
7th Feb 17 at 21:39   View User's Profile U2U Member Reply With Quote
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
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Registered: 20th May 12
Location: Oxfordshire
User status: Offline
8th Feb 17 at 06:57   View Garage View User's Profile U2U Member Reply With Quote
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.

 
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