electrical interference

[findlayjeff]

i just got the system installed i put amp and sub in, have you guys ever delt with a moaning sound coming from the sub, it sounds like an electrical interference, and the sound changes with the change of the rpm or if you turn the music up you can no loner her it

 

[Stick Figure]

i'm too lazy to type out everything to try, but ... http://www.google.com/search?source...&=&q=alternator+whine&btnG=Google+Search&aq=f

one of those links will give you some good ideas!

 

[findlayjeff]

i rerouted the the rca and the remote wire...no luck i tried moving the ground around....also no luck in fact at some points where i tried to ground it i picked up a pulsating sound threw the sub. pleas help

 

[shootmymime]

i smiled when i saw this, because i know the answer...

adjust your gain on your amp... and if its not as loud as you would like it then try this......


i know the 3rd gens have a premium sound system in the, that means there is an stock amp powering the speakers that is not build into the head unit..


but the bad thing for you is that you have to remove your head unit to get to it .


once you get your head unit out, follow your wires from the aftermarket wiring harness to a solver box about 2 inches by 5 inches. i believe there are 2 screws holding it there... once you take the screws out, unplug the wire harness. then (i believe you will need a new wire harness) to plug into the one that plugged into the back of the amp.


that extra amp was causing to much interference and is causing the buzz from the engine

just wish someone could have told me like this so i wouldn't of had to figure it out for my self... GOOD LUCK and if this dosnt make and since, let me know and ill try a post pic of some of the parts i am talking about

 

[shootmymime]

how does this work?!?

STEPS
1. "REMOVE THIS"
2. LOOK TO SEE IF YOU NEED A NEW ONE
3. PLUG THIS------TO THIS
4. TURN IT ON AND TEST TO SEE IF ITS GONE

 

[findlayjeff]

haha great pic. i did take out that amp when i put the head unit in i will go try to turn the gain down and see if that works

 

[shootmymime]

THEN ITS YOUR GAIN, (sorry caps) what an easy fix!

 

[findlayjeff]

:bash: dam i wish i would have tried that first i spent all morning redoing the wiring witch did not help and trying to move the ground around. once i messed with all the adjustments on the amp i got the sounds to go away. thank you for your help. now i will be putting everything back together.:rant: and then i will be -------> :rocker:

 

[shootmymime]

good luck let me know if it works

 

[borgzman]

"that extra amp was causing to much interference and is causing the buzz from the engine"

:iagree:
..The headunit itself has a built-in pre-amp and amp. The pre-amp picks up the sound from the tape head if you have cassette and from the CD lens(decoder) and the tuner. The low power audio is relayed to the main amp, built- in the car stereo itself, thats why you can control the volume and tone because of that amp circuitry. The output audio is already amplified when it reaches the speaker. Now we will add another aftermarket amp in series of the built-in amp and they are obviously not designed to match both input/output power, impedance and possibly power supply circuitry. You will have 2 IC amplifiers of different characteristics in series ?? the mismatch cuases the HUM and distortions.
I suggest, doing research when adding an "amp" it should be a "booster Transistor amp not IC amp. But buyers will just look at the labels and pay..Also when connecting an I-pod/portable players, Its better to have it wired parrallel to the Tape Head, by way of a selector switch..or just disable the tapehead and connect an Ipod input there, so as the audio will pass the pre-amp first, now the audio signal will have the proper input impedance and correct input power as it enters the amp(built-in the car stereo) NO HUM. Other remedy to minimize noise is proper filtering of the supply adding a capacitor is the most basic. Also the speakers should be "in-phase" with its other as not all amps are designed the same..Most of us will just look at the plus and minus or red and black and connect it respectively. But it may not sound the same - a counter clockwise wound speaker connected to the Left channel and a counter clockwise wound speaker connected to the Right channel are "out of phase" it will decrease the bass output and increase hum..we should try inverting the polarity of the other speaker and listen which sounds best..unless installed in the factory. ...also proper grounding...we can solder a wire in the chasis of the headunit to the chasis of an aftermarket amp to the body of the runner so as to send those interference to ground(electrostatics).
..it would take pros sometimes two days to minimize those hums when installing audio system.

 

[findlayjeff]

thanks guys i got it.... it was all in the amp

 

[shootmymime]

your welcome