Whinning Noise

[cacaman]

I just cant seem to get rid of this whinning noise!!

I own a VR acclaim i have a pioneer HU with 2 sets of RCAs running to a Custic 4 channel amp, the JL splits at the front and the Kicker sub are connected to the amp, with JL 6" in the rears running off the HU.
The RCAs and the power cable are running away from each other on both sides of the car, the earth is connected to where the back seats are screwed into the chasis of the car (the drivers side rear seat). I have sanded it down and the screw is screwed in quite tightly and securely to make sure there is proper contact but i still have the whinning noise, i tired the other side (passenger side rear seat) and still the same problem. I dont have many other close ground points and i'm left clueless on what to do, from what i can gather it seems as if the actual metal im grounding it to is just not a good conducter.

Any one else out there with a VR or VS with similar problems?

[StoneX]

What model Pioneer head unit? They have an internal fuse on the RCA ground track which can blow if the RCA's are unplugged or plugged in while the stereo has power and for a range of other reasons, that will cause engine noise.

You can test if it is that in a couple of ways;
You can take the head unit out completely and test the resistance or continuity from the head unit shell/chassis to the outer ring of the RCA sockets. They should both be ground, so there should be no resistance or a constant beep on the continuity test.
If you don't have a multimeter, you can leave head unit connected, just pull it out so you can get to the RCA plugs/leads... Get a bit of wire and strip the ends, touch one end to the head unit's shell/chassis and the other end to the outer ring of the RCA sockets, while your RCA's are still plugged in. Then get someone to turn the car and stereo on to see if the noise is still present.

[brohawk]

check your rca's there the main cause of it try rinning them the oposite way so if u have a straight end and a bent end sawp them so the straight end is were the bent end was n vice verca and make sure there pushed in tight

[StoneX]

You're not saying to turn the RCA's around are you? That is an old joke... RCA's are not directional.

[brohawk]

i no there not directional fool the ends fit tighter sometimes like what happened with mine 1 was there was whine the other there wasnt because they were a better fit so no noise. i no there not directional

[G4orce]

Hey make sure you Rcas are not running with your power cables this can be a big cause of the noise. Rcas should be on one side of the car and power, remore cables shoudl be the other side. They can cause interferance. Also maybe try running a noise filter, that can help a bit.
Another question what type of rcas are they some cheaper ones will always have the noise, when other more expensive ones, eg. stinger will not have the noise. I have had a few problems with noise through speakers and I used a noise filter and it stopped most noise but then i changed from audioline rcas to stinger and no more noise.
Also some rcas have an earth cable coming out either end and when connect to an earth the noise can stop.

If you have any other questions feel free to ask

[garfa]

What model Pioneer head unit? They have an internal fuse on the RCA ground track which can blow if the RCA's are unplugged or plugged in while the stereo has power and for a range of other reasons, that will cause engine noise.

stone plus blown pioneer ground track, pure magic!
personally i would put it down to crap grounding somewhere causing a ground loop if the blown ground track is not blown.
as for you brohawk calm down, not everyone hates you!

[wrx884]

i have a pioneer head deck DEH-7650mp n i had the noise in my car i got the grounding track replaced and it stopped apparently pioneer has this problem alot with there head units dunno y

tho i have a question is there only 1 grounding track inside there????

[StoneX]

What do you mean is there only one ground track? There is ground tracks everywhere, but only one for the RCA's as there should be nothing flowing through it as it is GROUND. The reason it burns is because people cause current to flow onto it...

[wrx884]

What do you mean is there only one ground track? There is ground tracks everywhere, but only one for the RCA's as there should be nothing flowing through it as it is GROUND. The reason it burns is because people cause current to flow onto it...

well i wasnt sure how many there was inside the head unit as wen i got mine replaced the bloke said he only replaced 1 of the grounding tracks i assume that means the rca 1ns???

so those other tracks cant get burnt out in ne way like the rca 1??? and how much did use pay 2 get 1 replaced???

[StoneX]

There is other areas of the circuit board that have ground tracks, but they wouldn't blow from an RCA fault, they'd only blow if there was other problems.

I haven't paid to have the problem fixed, i actually fix the problem.

[semi]

translation: stone repairs pioneer HUs for a living

[wrx884]

There is other areas of the circuit board that have ground tracks, but they wouldn't blow from an RCA fault, they'd only blow if there was other problems.

I haven't paid to have the problem fixed, i actually fix the problem.

so how much would u charge 2 fix n replace 1?

can cheap rca leads make this grounding track more prone 2 blowing aswell other than more expensive rca leads?? or am i just speaking shhit here hahaha?

[shaggerz]

Just putting it out there, but if people werent confident with repairing the damaged ground track themselves or didnt want to pay someone to do it, then would connecting the RCA ground to the head unit chassis ground also fix this problem?

[StoneX]

If the head unit is out of warranty, it is usually about $50-75 for normal head unit, more if it's an in-dash screen or something more complicated to pull apart like that. That's about how much it'll be if Pioneer does it... You're in Perth so R&I Electronics or someone would do the repair, i'm not sure on their costs. You could post to Pioneer in Melb if you really wanted.

Cheap RCA's won't cause it. A bad ground/earth on the amp or head unit can cause it, plugging or unplugging the RCA's while the head unit is on can cause it and i'm sure there is other ways but they're the most common. Always, turn everything off before changing any wiring/leads.

shaggerz... Yep, that would fix it. It'd be better if you could do that internally on the board though so it's unseen

[wrx884]

StoneX is there a way u can test the head unit 2 see if it is actually the grounding rca track??? and not the amps or rca leads or speakers making the noise???

[garfa]

yes put you DMM to continuity mode and then hold 1 probe on the chassis of the unit and 1 on the ground of the rca (eg the outer contact).
simple!

[wrx884]

wats supposed 2 happen wen u do that?? as i do have a DMM but im new 2 it n dont know all its fuctions yet? is it the 1 that buzzes?

[garfa]

something easier will be to set the dmm to resistance (ohms) and then if there is resistance (ground loop is created by resistance between grounds) the track is blown.