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[toytaco]

hakim100 previously said:

OK this is what I've had since last year...

Pioneer AVH-P6800
Fosgate punch 500 amp for sub
Fosgate punch 12" P2 in Q-logic box
Fosgate p450.4 4 channel amp
Components in the front, infiniti 3" in the rear

I've had noise since all that was put in, I went back and forth to circuit city 5 times, they made sure there was no ground loops, they moved the amp around, changed the grounds, re-ran the power wires farther from the RCA's...I sent the amp back and crutchfield sent me a brand new one, STILL NOISE...finally circuit city put RCA filters on, and it helped but I still had noise and just got used to it...

Recently I replaced the AVH-p6800 wit a Kenwood DNX 8120, and the Q logic box with the wicked cas box. I had the best local shop re-wire the 4 channel amp, they did a quality job (they work one imports, luxery cars, and do alot of custom work)...after two seperate times of trouble shooting there was still noise...I checked everything my self and the power wires are run separately, the ground is short, the noise filters are still on the RCA's (they even put on newer higher quality ones)...and there IS STILL NOISE... Finally they tinkered with the amp, and connected it to a single test speaker, and THERE WAS NOISE...so the shop is basically saying its my amp, which has already been replaced once...the last thing they did that helped a lil bit leave the amp unmounted, its just resting on the plastic under my passenger seat

Basically they said fosgate's sometimes make alot of noise...

My question is, what brand or maybe what model is notorious for good noise reduction...I need atleast 65 watts x 4 RMS at 4ohm (would like more)...and I don't want to spend more than 500...

I've read the JL A4300 is really good at noise reduction, but its really weak on power...

Also, alot of people have told me 4 channel amps are notorious for producing noise in big block V6's and V8's...is that true?

Any help would be good, and don't flame me if this has been posted before, i did the best searching i could, and found alot of trouble shooting on fixing noise, but nothing on the best amp for keeping noise low...

OH almost forgot, the noise is a soft buzz, with a whine in the background that gets higher pitched with RPM's

hakim100 previously said:

SandyFJ you gave some very good points, I think what I'm going to do is re wire all the power cables to one distributer box and ground that...

BUT they said it is for sure the amp because the disconnected everything but power and hooked up one test speaker, and the second you touched the RCA stubs with anything metal it started making the noise...

Does that make since? does taht mean it is for sure the amp or could still possibly be the grounding or other issues?

Hakim, where is it grounded? where is the amps grounded on the truck? True it is hard to say or help unless we can see your setup. It might contradict theories about setting up a sound system in a vehicle but try running the ground straight to the battery and see what happens.

If you use a big gauge wire from the battery positive to the amp/dist. block, and you ground the amp to the nearest clean metal there is with the same gauge wire, chances are is that the body of the truck isn't using the same gauge ground wire to the batt. and alternator ground. Try doing the "Big Three." and see if that helps.