Just out of curiosity, how do you have your amp mounted? Is the heat sink
to the amp grounded to the vehicles chassis or is it isolated? Many times
manufactures will tie the heat sink of their amps to the internal power
supplies floating secondary ground in an effort to eliminate ground loops.
Now, if you bolt the amp to the vehicles sheet metal you reconnect that
ground path. This not only can induce noise but can damage the amp.

Ge0
*******************************************
TeamAMP #4 - tech whiz type of guy
*******************************************
Low cost car stereo equipment repair/ modification
Contact me for advice or a quote.
Always interested in buying dead equipment too.
********************************************
Looking for answers on car stereo topics?
www.mobileaudio.com
www.teamrocs.com
http://go.to/bcae/
*******************************************
Geo uses:
Main Stage = a/d/s/ 346is
Rear fill = a/d/s/ 345is
Subs = Audiomobile Mass 2012 S24
Head unit = Alpine DVA-7996
Processor = Alpine PXA-H700
Sub Amp = a/d/s/ P4100.2
Main & rear fill amp = a/d/s/ P840.2
********************************************
www.microheat.com
********************************************

"Paul Vina" wrote in message
. net...
Check all of the speaker wiring, it may have rubbed through the insulation
somewhere and be causing a short.


Paul Vina


"Douglas Conder" wrote in message
ink.net...
Not the amp. I swapped them out before I came to work. Same Jl 300/4
in
both vehicles. Does the exact same thing. Hum still there and speakers
still shut off. I have had a few people suggest a ground loop but,
would
this affect the speakers shutting off? It could explain the hum but,
what
about the speakers?


"dconder" wrote in message
...
Will try that today for sure. Its kinda double-edged, I hope it is
not
the
amp but, then again, at least I would know what it is.


"Paul Vina" wrote in message
. net...
That pretty much rules out the Eclipse HU and the Diamonds. When
you
have
time, try the 300/4 in your wife's car and her amp in yours.


Paul Vina


"dconder" wrote in message
...
Ok, here is what I tried. Ran the rca's from my Eclipse brain
into
the
JL
amps in my other vehicle. I tried my hardest but could not hear
the
hum
and
pitch change. There was hiss but, no hum. I then hooked my
Alpine
IVA-C800, that is in my other vehicle, up to the JL amps in my
noise
vehicle
and the noise came thru the Diamonds just like from the Eclipse.
Maybe
not
quite as loud but, that could be a preamp voltage difference
between
the
two
units. I am pretty much at a loss. It started raining so, I am
done
for
the night but, any more suggestions you have, I will try. I
really
should
take the Eclipse out and have it checked to eliminate it but, I do
not
know
if anyone local can tell me that. I hate to have to send it in to
Eclipse
without knowing if it is bad or not.



"dconder" wrote in message
...
I guess that was too good to be true. I unhooked both speakers
and
hooked
up a test speaker that I ran straight out of the 300/4 amp. I
used
my
Image
Dynamics Chameleon, ran it thru its xover and only hooked up the
tweeter.
Noise still there, just like the Diamonds. I guess that
eliminates
the
Diamonds from being a problem. My wife just got home so, I am
going
to
run
from the Eclipse brain into the JL amps in my other vehicle.
Hopefully,
that will tell me something. I will update again in a few
minutes.


"Paul Vina" wrote in message
. net...
BINGO! I'll bet one of your speakers is bad and showing the
amp
a
short
or
is actually shorting directly to ground. Disconnect all of
the
speakers
and
then reconnect them one at a time until the noise comes back.
Once
you
find
the set that's bad you can do the same thing to see if it's
the
mid,
tweet
or crossover itself.


Paul Vina