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There are a few issues that may cause this, the most common have already been mentioned.

Others:

- Old graphic EQ's

- Cheap head units

- Faulty Amps (Dry soldier joints)

- Multiple devices with various ground points, causing an earth loop.

- Noisy Alternator

- And a few others :P

Good Luck!

The easiest way to pick up noise is to run your power lead too close to your ignition components, check this, and your earth points, rca near power. If this does not fix it you may need to fork out for a suppsessor from jaycar or wherever

When grounding your amps, make sure the ground wire actually touches metal... So sand off any paint in that little section around the bolt you are grounding it with...

Also, my skyline did not come with ... something i cant think of the name now... a little box thing that bolts to the altenator and helps to stop altenator whine... If someone can think of the name, please post it... But I had to pull one of a VK Commodore which fixed up a similar problem for me...

- Crimpage.

its not always the rca's too close to the power...

speshly in R33's where the batteries in the back so they dont run together at all...

mines doing the same thing...tried everything... gonna re-earth it tomorrow if not ill have to invest in one of those box thingies talked about above

its not always the rca's too close to the power...

speshly in R33's where the batteries in the back so they dont run together at all...

mines doing the same thing...tried everything... gonna re-earth it tomorrow if not ill have to invest in one of those box thingies talked about above

It is probably unlikely; but a while ago i had the same problem in my previous car. Tried everything, including those power noise filters and that rca noise filters (which where BS as the rca filters removed the noise but also the bass), as well as everything mentioned above. A little while later i bought a competion amp, at a great price, to power my sub. I had a decent genuine Rockford Fosgate pushing a Rockford 12", but this "new" amp was much more powerful. The moment i removed the Rockford amp, the noise disappeared. So there could also be something minor wrong with an amp, such as a "dry joint". Try swapping amps or by-passing them to test out you system.

It is probably unlikely; but a while ago i had the same problem in my previous car.  Tried everything, including those power noise filters and that rca noise filters (which where BS as the rca filters removed the noise but also the bass), as well as everything mentioned above.  A little while later i bought a competion amp, at a great price, to power my sub.  I had a decent genuine Rockford Fosgate pushing a Rockford 12", but this "new" amp was much more powerful.  The moment i removed the Rockford amp, the noise disappeared.  So there could also be something minor wrong with an amp, such as a "dry joint".  Try swapping amps or by-passing them to test out you system.

yeh i got the same problem at the moment.

replaced rca's

earthed it straight to the battery

got a noise filter thing (which didnt do anything at all)

i cant think of anything else other than it being sumthing rong with the amp

As suggested above main culprit can be the noise supressor on the alternator which is non existent.

RCA's to close together these days they are well shielded so this is the most unlikely possibility.

Could be the earth.

But it can also be the earth tracks on the Headunit which are blown due to inadequate earthing of the amplifier. If the earth is not adequate the amplifier will try to find a ground closest to itself and this is normally the tiny earth shield or outer core of the RCA cable which can only handle about 2 amps of return current. This blows the tiny tracks in the headunit so the noise is induced in the form of engine noise.

George

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