Right after me singing the cars praises fro 50k miles of service it's promptly paying me back by gaining a really annoying fault!

When I start the car in the morning all is fine, however as soon as the revs exceed about 18000rpm I get a crackle through the speakers, teh crackle is continuous and does not raise and fall with the revs it's there or it's not. After a few mile sof driving it does settle down but the crackle appears again briefly as the revs rise and fall past the 1800rpm mark. As a first port of call I checked the ground for the amplifiers but cleaning this up has achieved nothing.

It's now bugging the Hell out of me as other than this the old tank is relatively faultless

Radio is an aftermarket Alpine 9812RB

 

Would have thought a crackle from the speakers woudl be the least of your problems!

 

sounds like a supresser is on the way out not sure on the A4 alternator but they tend to be built in on most modern cars, also check the battery earth is good and any earth straps to the engine.

 

Just what I was thinking

 

or a bad earth?

 

I take it the fault has only just developed and the radio has worked fine before?

 

Install has been in the car for about 2 years without a problem.

18000rpm I need to wake up

 

Are speakers running from the headuint or an external amplifier?

 

take the speakers out - job done

 

you answered your own question then

 

Hey I'm on a week off, think the old brain has taken some time off as well.

It's a 3 amp system, headunit provides source only

 

Check the earth strap between body and bonnet hasn't broken.
tabetha

 

Cheers will look in a few minutes

 

Is it a seperate belt that runs the alternator? Is so try whipping that off quickly and try it!