Rca Noise

[08r3308]

hey pple i installed my amp in my r33 and wired it on passenger side of car thru to boot and mounter amp on top of fuel pump.

i get engine noise thru my speakers.

i have searched and i did use quality rca but its still there its driving me insane lol

any tips?

[DRD-00F]

Best guess would be to move it away from the fuel pump.

Are your RCAs running with any power wires?

[08r3308]

nope , only amp turn on wire.

i have the amp on 5mm peice of mdf so its not touching the wires or anything.

dr doof where have you mounted your amp.?

[DRD-00F]

Mine is a custom enclosure, technically, it sits where the spare tyre used to sit...

I've never had one above the fuel pump but that seems to cause alot of people problems. You'll probably find as well now that your RCA cables have been penetrated by the power and are creating noise, they will not shield as much anymore. Weird how it works like that but I've seen it happen a few times...

Can you ground your RCAs in any way? Normally the good ones have an extra cable running with them that you can ground to help minimise noise.

Here is a pic of my setup, completely useless to you, just thought I would share Clicky!

[Chris Rogers]

cheap and nasty fix - ground loop isolator. proper fix - relocate leads, reground amp for a start.

[DRD-00F]

What he said ^^^

[08r3308]

i been trying diff grounds for amp no luck , bit better but noise does not go completely.

gets higher when i switch my lights on

i also tried relocating leads , only other way i can thing is if i run them thru middle of the car ...take passenger seat out and run rca's throught .

i cant ground my rca's , doof that setup is nice

thanx for quick reply's boys

[08r3308]

ps.

i only notice it heaps in my tweeters ?

crossovers are mounted inside door trims

[DRD-00F]

Crossovers will be fine. Do you have a spare set of RCAs? Even ones that aren't shielded?

Like I said, once the RCAs are corrupted, without getting new ones, you're going to have a tough time getting rid of the noise completely, but you have to sort it out or the same thing will just keep on happening.

What spec is the amp? And what grounds have you been trying? I would keep trying to find a good ground if I were you, maybe sand back some paint if it's stopping a good connection.

What about your battery? What's that like?

[08r3308]

i got a new set of rca yesterday , amp is mtx maybe 6-7mnth old(about 60x4 rms)

i took the spare tyre out and there's few points where i sanded paint off and put ground there.

battery is standard.

did you run your rca and speaker cables together or yours are separate?

damn corrupt rca's hehe

i might try taking h/u out and checking if any of looms cables are cousing it but i doubt that.

[DRD-00F]

I'm trying to remember how I did mine...

I ran a lot of wires up the middle but I forget which ones basically, I kept all RCA and any power wires very seperate (i think)... I've never had a problem.

My system is set up just a WEEEEE bit different to yours though... not a very good base for comparison at all.

[08r3308]

i took the head unit out fiddled around a bit lowered noise tiny bit but once i turn my headlights on noise is back.

im getting sick of it , i think i will take the amp out and run the system off deck , i only run rears and fronts

the whine is killing me hehe

[some_cs_student]

I've run RCA's next to speaker power wires, they are twisted pair RCA's though and I don't have an issue.

Not sure if it was the twisted pair construction which helped or not, I'd like to hear an opinion on that. The guys on Mobile Electronics seem to recommend twisted pair RCA's to prevent interference...

I also had what looked like car power wires running up the LHS and RHS of the car (battery in boot) I tried to keep away from them but the RCA's are pretty close, no issues though...

[frx026]

heres a few things to have a look at.

re-earth your car not just the amp.

That crappy earth wire that runs from the passenger inner guard to the exhaust manifold on a r33 needs to be replaced with something that is thicker and can handle more current difference.

Your head unit, a nice thick piece of graound cable from the chasis of the car to the chasis of the head unit.

Your power wire from the amp to the battery, move it away from the fuses and main feed for the car.

your earth wire on your amp - connect it to a different bolt in the boot than the factory earthing bolt under the battery.

make sure all the connectors you use are soldered, dont just rely on those crappy "gold" screw type connectors.

RCA's - twisted pair is a marketting ploy to get more $$ outta you. The amount of money you would need to spend on a system to hear an actual difference in RCA performance is more than you would spend buying a r33.

you can just always earth the outer sheilding on your existing rca's aswell..

if you do these basic's it should be fine as long you have good quality equipment.

My amp sits on a piece of timber mounted above a hi-flow intank fuel pump and the system has no noise to it.

[08r3308]

ok will give a try to some of this stuff tomorrow see how i go

the head unit and batt i have done tonight

how do you ground rcas outer shield?

[frx026]

to grond the rca's

you need to

- be careful

- cut through the plastic sheilding of the rca cable til you get the braided cable..(this goes to the outer part of the rca plug.. and it may also be a wire rather than braid on cheap rca...

- do not break this braid/wire - join another wire onto it

- becareful when soldering as to not burn through your rca's totally

- do near both ends of the rca cable

- once you have a wire soldered in at each in - earth each wire directly to the chasis

- do not earth them to other wires or amp/head unit earths.

thats about it, take your time and dont rush..

[08r3308]

thank you for that.

i will try all the stuff before i chop the rcas and ground them , im hopping i can get it fixed.

which earth wire in engine bay?

anyone got a pic?

[Carbon 34]

radio noise guide, the bible from the master

http://www.termpro.com/articles/noise.html

[rocketboy]

What headunit do you have?

[08r3308]

clarion DXZ786USB

i tried everything but still noise is there.