Noise problem from sound system

[Steve69]

Hey guys

I have a 2 amps one is a Alpine and the other is a off brand but like 1200 watts.
The problem Im having is poping and cracking through the speakers. I have
1200 amp connected to front speakers and a subwoofer. I have the Alpine speakers connected to the rear 6x9 speakers. I have a Jenson Cd player
with a y splitter for the pre amp plugs going to the amps. The cracks and pops
seem to be comming when the engine is running and driving. I turned the
system on parked and not running for hour and half with just good music.
I bounced the rear end around a few times also for maybe a short or something
and no cracks or pops from system. Any tests I can do to narrow the problem
down. Im leaning towards the cheaper amp. Ive also have a electric fan and
Ive noticed when it kicks on there is a buss through the speakers from the
Fan also.

Thanks for the help.
Steve

 

[iskwezm]

You have ground loop noise.Some noses are a pain in the a$$ to isolate.try checking your grounds,moving the RCA's away from any power wires.If that doesnt work, get a couple of ground loop isolaters and put them inline at the amps' RCA's.If that doesnt work try a 40 amp noise filter in the power wire for the stereo.

Also check your spark plug wires,they can also be a source for interference.

 

[brianj5600]

My problem was running the power wire and the pre-amp cord together. Both were run under the sill plate to the trunk. I moved the pre-amp wire 6" away and all my noise was gone. If you run them together, that could be it. Bad grounds is another possibility.

 

[ForceFed70]

You have ground loop noise.Some noses are a pain in the a$$ to isolate.try checking your grounds,moving the RCA's away from any power wires.If that doesnt work, get a couple of ground loop isolaters and put them inline at the amps' RCA's.If that doesnt work try a 40 amp noise filter in the power wire for the stereo.

Also check your spark plug wires,they can also be a source for interference.

What he said... well except the ground loop stuff. Moving the RCA's away from the power cables for example (which is an excellent suggestion) has nothing to do with a ground loop.

Usually, this type of noise shows up as a buzz or hum... not so much popping and crackleing. Can you tell at all if the problem has anything to do with vibration?

Oh... and most cheaper amps are worse for this type of problem. 1 of the places they cut corners to make a cheaper product is with the noise canceling and filtering circuits.

Another thing to look into is the quality of your RCA cables. Poor quality cables pick up alot more noise.

 

[65fastbackresto]

I never could get the noise out

when I was running cheaper amps. I had a $20 off brand something amp and it hissed and cracked and made all kinds of noise with the motor running. Upgraded to a Pioneer (this was years ago) and 95% of the noise was gone.

 

[Steve69]

I been on some short trips and made no noise except when the the electric
fan kicked on. I went on a longer trip and all of sudden had the popping and
cracking. Ill have to check out how close the pre amp cables are to the power
and check out my ground. Thanks for suggestions.

Steve