problem just started. Now it won't go away.

I had my fronts, and rears on a 4 channel. And my sub on a mono. Noise in every speaker including the sub, it has a low hum. And whenever I turn any electronics on, you can hear them through the speakers. And then there's the whine noise that goes with the engine rpm. Just started about 2 weeks ago or so. They worked perfectly before

 

I'm probably going to redo everything

 

no, im not asking what kinda amp they are hooked up to. I am curious, FROM the amp, where do the wires go? directly to each speaker, or do you have it looped through either the rear or front?

 

Directly to each speakers separately

 

the only thing that is weird is how you get the hum when you unplug the RCAs from the amp. That means you are still some how getting signal to your speakers.

At this point, you have already tried a different amp and the same thing happened, there for, it sounds like an issue with wiring, damn this is a tough one.

Does every single speaker hum?

 

Before you redo everything. Take the power out of the sub amplifier. See if the 4channel hums.

So you have the RCA out from the headunit connected to the 4-cahnnel? Then speaker wire out from the 4-channel to each speaker? Try this with your old rca hook it up from headunit remove the rest, dont snake it just run it outside the car or something. Then take out one of the speaker or use a spare speaker and hook it up to the amp, dont mount the speaker just free air it. If it doesnt hum, start hooking up the speaker wire/speakers/RCA you installed in the car one by one until you hear it humm.

That test should take about 5-10mins. Rewiring your car takes along time.

 

Only the speakers that are hooked to an amp

 

It whines if I have the 4 gauge hooked straight to one of the amps

 

I'll try holding a speaker and hooking it straight to the amp. And old rcas outside the car

 

The problem is a ground somewhere NOT being good enough..Alot of the trunk is aluminium and thats not a good ground. You are hearing the Alt. thru the speakers..it will still hum even when the amp inputs are shorted out..everything powered will hum until the ground loop is fixed. In home audio, sometimes you had to float the ground (not connected) on the amps power cord (3 prong ac cord) to isolate the amps power from the ground and stop the hum. Pete

 

at one time there was no whining sound with the ground. Now there is a whining sound with anything.

 

I had this same problem. Changed radios, changed rcas, changed amps, blah blah blah - nothing worked.

Try upgrading the main vehicle ground off the battery and the other one on the firewall, can't remember off hand where it goes.

 

How many feet of cable do i need? What size did you upgrade to?

 

Not very much at all. When I get home I'll take pics of what we did.

 

Great! Thanks man! I can't wait to see, and try it out. I'm willing to do anything!!!!