Alternator noise to power AMP
audi at humanspeakers.com
Mon Apr 4 19:44:26 EDT 2005
> After recently wiring in a power amp to the rear speakers for my '83 Ur
> Quattro, there is a whine being picked up by the RCA inputs to the amp. It
> is not picked up by the stereo, front speakers, or if rears are wired
> directly to the stereo without an amp.
> How can I eliminate this or filter it? I am using high quality RCA cables -
> don't know if they are sheilded.
Try rewiring your grounds so they are all attached to the same place.
Also, "directional" RCA cables (shield only attached to ground at
pre-amp end) can help. On my coupe I ran ground cables forward from the
amps to the shifter mounting bolts, and also grounded the head unit
there. On my 90Q I ran a ground wire back from the head unit to a
bumper mount bolt in the trunk where I grounded the amp. Neither car
has any appreciable ignition/alternator noise, which is nice.
> Also, what kind of capaciter would be good to eliminate powere clipping?
Although I know people seem to love their 1 F etc. caps in the trunk, a
good heavy power/ground cable ought to be enough - your battery is one
heck of a charge storage device...
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