hello...
i have been reading in the forums and i have found out that a lot of ppl are having issues with interference noise in their sound...
I just want to get everything cleared up before i install my amp so i dont get the ame problem as they did when they installed their amps...

so far i have found out that :
1. When wiring the power cable run it seperately and away from the speaker cables.....
Q. So i have to run the power cable as far away from the speaker cables and RCA cable...
But can i run the Speaker Cables (comming out of the amP) and the RCA (going into the amp) cable togeather (close to ecah other , eg.zip tied togeather) ?

Thats just the main question....
p.s i am running a 4ch amp for 4 speakers..

Noise tends to be picked up by the rcas. You'd be better off running the power/speaker wire together than the rca/speaker wiring, from my knowledge.

Also

When running rca's. make sure the headunit and car, at LEAST is disconnected. Preferably, the whole battery.
You must not let the rca end plugs touch bare metal when one end is plugged into a powered up headunit.
This will damage the earth tracks in the headunit, which is the cause of at least 50% of the noise issues we see here.

Its also the least known "hidden danger" of installation. Not many know about it.

Double check you have a fuse that suits the size of the smallest power/ground cable on that circuit. If you had 4ga power wire, and 8ga ground (no distro), use a fuse to suit 8ga.

Make sure your ground point is sanded back to bare metal, and use a multi-meter to check its got a low resistance. Again, too high a resistance, and your amp will try to earth through the rca's, blowing that headunit component and causing a great deal of noise.

by making sure i have a low resistance on the ground.....
How low should this resistance measure on the multimeter ?

i have 2 more questions....
1. when you sand back to bare metal on your ground point, you said make sure the resistance is low .....
how low are we talking about here....
2. How do you measure resistance with a multimeter... Do i put both leads to ground or 1 to ground and the other to +12v .......

Pretty sure you put one lead on the battery negative post, the other on your grounding point. A resistance of what...less than 0.3 ohms? is ideal...i think.
Wait for someone to confirm.

any more than 0.1 ohms is asking for trouble

there ya go

Even with a resistance of 0.1 ohm, there will be a voltage drop of more than 0.5v if there is a current draw of greater than 5 amps. (V=IxR)
So it should measure <0.1 ohm. (depends on how accurate the multimeter is) If you've done it properly, you shouldn't really need to measure it...


There are tutorials on this stuff:

Fuse and cable size Tutorial (shows the calculations for voltage drop).
http://www.caraudioaustralia.com/forums/in...showtopic=42643
Eliminating Engine Noise tutorial:
http://www.caraudioaustralia.com/forums/in...showtopic=42644