I have a gs430 with nav no mark lev. Just got done installing a signal processer new speakers,sub and amps. Now I'm setting all the levels and x-overs and there is all kinds of alternator noise. Ive checked everything to no help. There was crackling noises with the car not running to, I think I have that fixed but the alt noise wont go away. Have any of you guys had to use a alt. noise filter?

 

Double check the gain structure of all components. Gain ***** on amps aren't volume control.
Check the grounding point of the system.
Which processor are you using?
Where are you tapping into the factory system?

 

Checked all GND point they are within .3 ohms. That was my thought to. The audio control LC8i processer is power and GND isolated strait to the battery now. I was using the P&G at the factory amp... I'm tapping in
at the amp for signal behind the glove box. Ive used wire to buy pass(run on the out side of the car) the remote turn on, processor P&G and amp power.