speaker lead to RCA converter.

[Dave_IOW]

Right, ran all wires in mk4 golf yesterday and want to keep standard HU.

RCA, and front component wires down one side, power lead and remote down other side. Good ground connected to rear seat belt bolt.

Rears just connected to HU.

Problem is, the converter i bought, converts left and right front speakers to RCA outputs, all straight forward stuff and also has a ground wire.

With ground from RCA adaptor plugged in 100% volume but alternator whine, probably from creating loop with amplifier one?
Without ground from RCA adaptor plugged in 50% volume and very minimal whine.

What should i do, im happy with everything without it plugged in, but have to turn all levels up to get desired volume, which sounds slightly stressed, and im sure this cant do amp any favours?

Or do i run a new ground directly from battery to headunit (as heard this can help), and also connect the RCA adaptor ground to this?

Any opinions?

[jonnypolish]

A seat belt bolt is a terrible ground...
You ideally need to touch the chassis/bodywork of the car!

[Dave_IOW]

Oh right, i scratched the paint away surrounding it and got as much of the cable to touch the bare metal aswell as the bolt, ill try and find somewhere better.

Any opinions on Isolation loops, i know that they dont solve the problem, and just hide it, but if that works, is that a problem??

[troublestarter]

theres nothing wrong with using a seat belt bolt as long as it is a nice bare metal connection and is nice and tight
also why did you not buy the actual rca adapter for the mk4 as below
http://www.awesomeautomotive.co.uk/catalog/product_info.php?cPath=50_104&products_id=756

[Dave_IOW]

Was all done on a whim as to speak and that was to hand, although now, all has been sorted and have nice shiny headunit in courtesy of a friend which stopped everything, now i have real nice sound!

Thanks for comments