Just fitted an amp in the boot and wired it all up with fat wires all the way to the doors and rear speakers.

 

2 questions

 

1. Is it OK to just disconnect the speaker outputs from the head unit now the 4 channel amp is wired to the speakers because thats what I did?

 

2. It sounds great till I start the engine then the alternator whines thru the quiet bits like a 747 taxiing. Do I need a capacitor or is it because I routed the power lead along with the speaker and phono leads?

Check you have a good earth to bare metal, this is the most common problem for interferance.

Failing that buy a ground loop isolator, should be about £12-£15.

 

Bob

It could be because you run the power along the phono`s, although i dont have this problem iv heard it is quite common. I wouldnt bother with a capacitor unless your running atleast 3 or 4 amps or a huge powerful bass amp. Deffonatly check your earth as a dodgy earth can drain the battery (I know).