The stereo in the car works fine, until the cooling fans kick in, and
a large noise/buzz sound comes from the subs. The volume can be a
very low, and still occurs. If I disconnect one of the fans this does
not occur.

Setup:
Stock unit, with pre-outs (2) to Alpine MRD-752 5ch amp. Two Orion
Subs, Alpine DDD fronts and DDD Rears.
4 Gauge from the Battery to the Amp, and 4 Gauge to the chassis
ground.

It seams to be a current surge, but have been unable to determine what
is causing the problem.

Please reply to the thread as this may help others!

Thanks

hit up this link for some help.
http://www.teamrocs.com/technical/pages/noise.htm

EFFENDI


"Snappa" wrote in message
om...
The stereo in the car works fine, until the cooling fans kick in, and
a large noise/buzz sound comes from the subs. The volume can be a
very low, and still occurs. If I disconnect one of the fans this does
not occur.

Setup:
Stock unit, with pre-outs (2) to Alpine MRD-752 5ch amp. Two Orion
Subs, Alpine DDD fronts and DDD Rears.
4 Gauge from the Battery to the Amp, and 4 Gauge to the chassis
ground.

It seams to be a current surge, but have been unable to determine what
is causing the problem.

Please reply to the thread as this may help others!

Thanks

The stereo in the car works fine, until the cooling fans kick in, and
a large noise/buzz sound comes from the subs. The volume can be a
very low, and still occurs. If I disconnect one of the fans this does
not occur.

Setup:
Stock unit, with pre-outs (2) to Alpine MRD-752 5ch amp. Two Orion
Subs, Alpine DDD fronts and DDD Rears.
4 Gauge from the Battery to the Amp, and 4 Gauge to the chassis
ground.

It seams to be a current surge, but have been unable to determine what
is causing the problem.

Please reply to the thread as this may help others!

What fan?

"-E-F-F-E-N-D-I-" wrote in message ...
hit up this link for some help.
http://www.teamrocs.com/technical/pages/noise.htm

EFFENDI


"Snappa" wrote in message
om...
The stereo in the car works fine, until the cooling fans kick in, and
a large noise/buzz sound comes from the subs. The volume can be a
very low, and still occurs. If I disconnect one of the fans this does
not occur.

Setup:
Stock unit, with pre-outs (2) to Alpine MRD-752 5ch amp. Two Orion
Subs, Alpine DDD fronts and DDD Rears.
4 Gauge from the Battery to the Amp, and 4 Gauge to the chassis
ground.

It seams to be a current surge, but have been unable to determine what
is causing the problem.

Please reply to the thread as this may help others!

Thanks

I get the same problem, hum in sub with engine running and when the
lights are on, causing what i presume to be stress on the alternator.
is there a way to filter the power to get the low end noise out? The
usual "papers" refer to whine, not humm. i disconnect the audio leads
and still get humm.

thanks

What fan?

The Fan I am referring to is the engine cooling fans!

To expand a little on the above problem..

1. I have run 4GA from the Battery +ve to the amp.
2. I have run 4GA from the Battery -ve to the Chassis
3. I have moved the ground point near the amp to another spot.
4. I have run 4GA from the amp to the new ground spot.

What has occurred...

1. I still get the loud noise, but it is now where near as loud as it
was.
2. I still get a low level hum especially when the lights are turned
on.
3. I tried to even earth the head unit to the same earth on the amp.
Nothing!

Could it be:

1. Bad alternator, and if so, how can i test that it is putting out
the stated amps?
2. Bad battery, if so how can i test?
3. Would Ground Loop Isolators fix the issue?
4. Will placing a line driver isolate the ground, and boost the
signal, therefore fixing the problem?

HELP!!

(Snappa) wrote in message . com...
What fan?

The Fan I am referring to is the engine cooling fans!


Alternately, you may consider that one of the fans has developed a
loose/burnt/defective winding, leading to excessive EMF noise
generation. Does the sound go away only when you disconnect the fan A
or either fan A or B? If the noise goes away when you disconnect fan
A, but not when you disconnect fan B (fan A reconnected, of course),
then possibly you have isolated the "bad" fan. If the noise goes away
when either fan is disconnected, then maybe this is an excessive
(relatively) current draw that is exacerbating a problem in the
alternator or internal rectifiers (of the alternator)?

I had an electrical whine that corresponded to when I turned the air
vent fan to med or hight once. The problem has since disappeared, and
I have no idea why. It could return someday, as well. Hope it
doesn't, though... [knocks on wood]