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
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
that is alternator noise and is due to a faulty install. you could have a v12 for all i care, no vehicle will make more noise than another.
as far as amps go, find one in your budget.
there are good installers everywhere, but i have seen some shady stuff walk out of big box stores. the most common thing that i check for if engine/alternator whine is present is a bad ground. i fixed one the other day in this kids F150. circuit installed the ground under a seat box. they also removed the 40 section of the 60/40 rear seat to install the generic box. and they installed the amps with two screws under the front seats instead of throwing them on the rear wall like they should be. and all of this should have been ran from 1/0 or two 4 gauges, instead a single 8 gauge from the battery, split by a butt connector into two 10 gauge runs to the amps. did i mention that the wrong size ring terminal was used and it wouldnt fit over the stud, so they cut it in half and tightened the nut down and sandwiched the 1/3 of the ring terminal left.
There is some great info up there, you will also want to physically check where all the grounds in the audio system are, they all need to be at the same point(headunit, processors, amp, satalite radio, etc...), and that the engine and body grounds have been upgraded as well, this can be an issue...
The A4300 power ratings are at 12V not at 14.4 like most everyone else's, so the ratings are a little under what they actually are.
Balanced cabling is another way as well to reduce induced noise, audison makes rca 2 bal adapters for there VRX series amps that you can buy. The Balanced signal is that of pro audio(live) and is very resistant to noise induction.
But 9 out of 10 times it will be install related and can be fixed without spending more money on products.
if you have noise before the amp, all a line driver is going to do is amplify that noise. it probably wont help. start with the basics. making sure your grounding points are solid. making sure the RCA's arent damaged or pinched.
Kind of off topic but I wonder if a hybrid car generates more or less noise in an audio system. I bet the large electric motor puts out a pretty bad EM field.
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?
Yeah...I can go out to my vehicle unhook the line driver and prove you wrong right now if you want. With my line driver unplugged and the amp gains turned up enough to match where the line driver was at I have FAR more background noise and a slight interference sound from what sounds like the ECU, as it is not a alternator whine. The second the line driver goes in it boosts the signal which helps throw out the ambient noise and interference, this is what ANY good line driver will do. A stronger signal is going to resist interference far better than a weaker signal. Given that, if you have an ECLIPSE headunit or the likes, you would not NEED one, as those produce a sturdy 5v signal via RCAS, where as Pioneers, Alpines, and so forth, only do around 2v max.
However, I can't say this will FIX his problem like it does mine, mine is odd, I've checked everything, did the big 3 all with 0 gauge, ran the wires correctly, did just about everything possible to remedy the problem and it was still there, I personally believe the HU (D3) is bringing the noise in. Even if I run the RCAS and tape them to the headliner and test the sound without the matrix I still have a slight interference "hiss" when the engine is on, and there ain't no way the grounds are bad.
prove me wrong if you wish. its all on your install. eclipse is garbage. i hate the one i installed in my truck. i run an alpine 9855 with a full balanced system in my FJ. you cant say anything about preamp voltages from one deck manufacturer to the next because unlike amplifier ratings, the CEA does not regulate how decks output voltages are rated. some are rms, some are peak to peak, some are just peak, but i'm sure you know that.
yes, a line driver will give you a stronger signal that is less resistant to radiated noise. but it will never improve the quality of sound. it may get louder, but louder does not make anything sound better. if you have noise to begin with at the deck or recording, now you have amplified noise.
you sound very well educated on the topic , so i will save my breathe and not argue with you.
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?
its hard to diagnose a common problem over the internet without ever seeing the vehicle.
Then according to you claims of Audiocontrol, Zapco, and so forth are all total B.S. Zapco uses a different cable, whoopie, still the same idea put into the design of the driver\processor itself. The line driver in my vehicle made the music far sharper and cleaner, my friends noticed it too. I have my experience with them, and you have yours, let's leave it at that. With me, it reduced ambient noise and increased sound quality by a great deal, also eliminated the need to use the amplifier gain controls and made the amp work less. Well worth the cost.
an amplifier with no processor improved the sound? hmm, not buying it. if you input floor noise into the line driver, you are going to get amplified floor noise on the way out of it. it doesnt get rid of anything, just amplifies everything thrown into it. seems as though you are a victim of advertising and the placebo effect.
and when you say your friends have noticed it too... is that supposed to make your BS claim more valid. if your friends are anything like you their word is useless as well.
please stop. you have no clue what you are talking about.
There is some great info up there, you will also want to physically check where all the grounds in the audio system are, they all need to be at the same point(headunit, processors, amp, satalite radio, etc...), and that the engine and body grounds have been upgraded as well, this can be an issue...
The A4300 power ratings are at 12V not at 14.4 like most everyone else's, so the ratings are a little under what they actually are.
Balanced cabling is another way as well to reduce induced noise, audison makes rca 2 bal adapters for there VRX series amps that you can buy. The Balanced signal is that of pro audio(live) and is very resistant to noise induction.
But 9 out of 10 times it will be install related and can be fixed without spending more money on products.
all ratings for amplifiers are on an even plane. CEA-2006 standards.
, so i will save my breathe and not argue with you.
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