Whining noise from speakers???

[SICKMADE]

OK i got a 1000 watt 4 channel amp for inside speakers and a 4000 watt 2 channel amp for subs.. grounds are good but everytime i turn on the car theres this whining noise that comes from the speakers and it gets a more high pitched sound when i press the gas, i know its coming from the 4000 watt amp because when i take out the fuses from the 4000 amp the noise goes away from the inside speakers.. i bought a ground loop isolator but it didnt do nothing.. could it be a faulty amp... its a lanzar mxa.. or do i need another isolator.. somebody please help

 

[Travis S]

Look at every wire that goes near the power wire and move it over 6 inches away from it. If thats not possible make it so it passes over it and a 90 degree angle. If thats not possble get really expensive speaker wires and patch cables as they are best built to resist interference.

 

[Kyle W]

its called alternator whine and i believe it occurs sometimes when the rca cable is run too close to the power wire

 

[747PLT]

your getting induced noise probably because the speaker wires are too close to the power wires. try moving them to opposite sides of the car. or if you're willing to spend some money then buy wires that prevent induced noise from occurring.

 

[burn]

It sounds like alternator interference.
Make sure you have a 3mfd suppressor fitted to your alternator.
If this does not solve make sure all your wires are screened and grounded correctly.