Try a RadioShack ground loop isolater ($15) between the head unit and the
amp to see if things quiet down. Try to be sure none of the RCA outer
shells are touching ground anywhere.
Good luck
"A. Allen" wrote in message
...
Hi all - I vowed I wouldn't join the masses and post a question to help
with
a noise problem - but I've got one, and my reading and attempts so far
haven't fixed it so...
I recently installed a new amp (Boss Audio), subs (Pioneer 10") and
head-unit (Panasonic CQ-DFX572 - I think its an international model and
may
be called something different in other countries) in my Commodore (for you
aussies). Since the install my front speakers (Kenwood 6") have exhibited
an
audiable buzzz. Its not particularly loud, its only noticable during
silent
parts of the music. It goes away if I remove the either both the subwoofer
RCAs or both the front speaker RCAs from my amp (only subs and fronts are
running off the amp). It doesn't change when the car is on or off or with
engine rpm. It does change when I adjust the gain to the front speakers on
the amp. It doesn't change much when the volume on the head unit is
changed.
Its on right from when the head unit switches on to when its turned off.
As to my install, I've got my speaker wires running up under the roof
trim,
my amp power wire running in the lower door foot trim and my RCAs running
down the center hump. I've checked my ground point, cleaned it back to
bright shiny metal, installed a washer to help apply pressure.
I'm pretty sure its not the speakers because they were fine before the
install and are fine when the subwoofer RCAs are pulled. My only ideas how
to fix it now are to completely relocate the gound point. Its currently
into
body metal on the front of the trunk - for those familiar with commodores
its into the seat support metal in the sedan. I could probably move it
lower
down so it was directly onto frame material but I'm not sure it would help
signifcantly - its already on a well integrated piece of steel. Another
idea
would be to start moving cables around... but where? - everything it as
far
away as I can see practical. Finally my last option I guess is to check
the
ground on the head unit - its currently to the factory ground wire - I
assumed this would be sufficient.
So any ideas people? - is it likely that it could be a problem with the
head
unit? The head unit has 6 pre-outs - 2 front, 2 rear, 2 subs. I'm using
the
2 front and the 2 subs with the rear speakers being driven off the
headunit
preamp. It it possible it could be the amp? I wouldn't have thought so
since
it seems capable of making noise free music under some circumstances.
Anyway, any help would be greatly appriciated - especially if it would
save
me the hassle of ripping stuff out again. Any body interested in my
install
so far can check out http://allen.alphadimensions.net/~aidan/audio.htm
best regards
Aidan
To reply remove the .au and swap the allen and alphadimensions in my
address.
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BE(Mech) Hons (Mat. Eng.)