Interfearance

wul3er · Post by **wul3er** » Sat Mar 06, 2004 9:28 pm

Hi just finished wiring up my boot build which consists of 2 amps being run from from a 10mm power cable which goes to a distribution block and comes out as 2 8AWG wires. I also have a power cap which is just beofre the sub amp. It sound great but when the car is started is interfears and a squeeling type noise comes through my 6*9's

I have the power cable coming up the passenger side of the car and all the rest of cables coming up the Drivers side.

I know this has something to do with the wires. So my question is. Is there an easy way to solve the problem.

Speedlaw · Post by **Speedlaw** » Sat Mar 06, 2004 9:34 pm

What's the scoop on the - cables?

wul3er · Post by **wul3er** » Sat Mar 06, 2004 10:55 pm

Not sure, what is meant by scoop. How do i find out.

Speedlaw · Post by **Speedlaw** » Sat Mar 06, 2004 11:45 pm

I mean, what's the story on the earthing? Is it grounded well? What size cable, how well is it connected to an earthing point?

(Sorry for being vague

)

wul3er · Post by **wul3er** » Mon Mar 08, 2004 12:05 am

Thats ok,

Its 4 AWG cable which is 100mm Thick but then that splits and goes into 2 of which are about 7mm thich (8 AWG)

It is earthed on the bolt that holds the part you plug the seat belt into (if that makes sense)

This is were i have always had my amp earthed and i have never had this problem b4.

Speedlaw · Post by **Speedlaw** » Mon Mar 08, 2004 10:27 am

Hmm... That's not an option then.

What if you take the cap out of the powerline, does that make a difference? Should the cap be earthed on the same place as the amp? (No experience with caps myself).

Did anything change with the headunit? Could that cause the ground loop?

I had some nasty interference once, it turned out my pre-out leads (coming out of the headunit) had an internal break, causing the interference. Changed the headunit, end of problem.

Clawz · Post by **Clawz** » Mon Mar 08, 2004 8:01 pm

As far as I was aware, you should always run the power cable up one side of the car and the speaker cabling along the other. Are you sure that the powcabling for your lights etc isn't running up the same side as your speaker cabling?

If you don't do this, the close proximately of the power cables interfere with the signal along the speaker cabling.

Lots of people notice this when they put on their indicators...

wul3er · Post by **wul3er** » Wed Mar 10, 2004 6:35 pm

I went and spoke to the guys at my local audio shop they have advised me to change the earth, then check both amps seperate and check both sets of rca's seperate. So i'll do this and at the weekend.

This is something i will keep updated coz i think it could be a common problem to a lot of people

KarlM · Post by **KarlM** » Thu Mar 11, 2004 12:48 pm

check all the connections to make sure there good and secure.

The cap needs be in parrel to the amp and as close the amp as possible

wul3er · Post by **wul3er** » Thu Mar 11, 2004 4:57 pm

I have the cap parralell with the amp and it is pretty close as well. I will checking all the connections as well this weekend.

polo2k · Post by **polo2k** » Wed Mar 17, 2004 7:14 pm

paralell isnt positioning its the electrical location of it in the eLectrical systembasically what it means is that the cap isnt "spliced into a cable" fitted in line it is connected to both the positive and the negative wire one terminal to each