Stereo sound issues

Mazdaboy · 06-04-2012, 06:27 PM

Hey all.
So I have a question that I'm not sure if anyone has an answer or if its been asked before.
I have pulled out and re-installed my stereo system like 10 times, I've rewired over and over and I don't use any of the origanal wiring for the sound system except power, accessory and earth.
ISSUE:
When I start the car I get a high pitch whistle through my speakers and it gets louder as the rpm climbs up.
Any ideas?
Help is much needed, due to its doing my head in.
Cheers.

BTW its a "96" BA 323 Astina hatch.

Ben · 06-04-2012, 07:05 PM

Its a ground problem. Generally its between the stereo and a amp if you run the power cables with the stereo cables together. Your meant to run the cables on the opposite side of the car...

However, you can buy a ground loop isolator and it will fix it... There about $20ish from jb. Or find a better ground source...

Jastel · 06-04-2012, 08:20 PM

I agree. I always run the power cable and RCA leads down opposite sides and the speaker wires down the middle.

xeon8 · 06-04-2012, 08:20 PM

Quote:

Originally Posted by Mazdaboy

When I start the car I get a high pitch whistle through my speakers and it gets louder as the rpm climbs up.
Any ideas?

I had the same problem in my car, and Ben is correct, it is a grounding problem.

I simply ran a ground wire from the amp directly to the battery and that sorted the issue - gave the cleanest possible ground.

phildough · 06-04-2012, 09:03 PM

You can also run an extra earth return from a nice clean bolt to the earth terminal.
This is a must as every wire off the positive terminal should have an equal sized one on the negative.
Another way of fixing it is all car stereo items run a common earth point. Amp and headunit all earthed to the same spot.

Drift Thorpey · 07-04-2012, 12:41 AM

Pretty much what xeon said, but go to the earthing bolt that the battery uses for a separate ground that should remove any hissing you get.

Mazdaboy · 07-04-2012, 07:02 AM

Thanks for the help guys. All though my power wire speaker wire and RCA are all separate until they get to the amp that's where they all meet up and I just ground the amp to a bolt in the back of the car. But if what your saying is right I'll try that. After all I have all the equipment to do them all

and my loop issolator is on its way

rodhog · 07-04-2012, 08:12 AM

Sometimes you also get it where poor quality RCA's are used. Like it's been said ground loop. THe grounding of the RCA's is poor can also give this effect, I've seen it on some installed where they have done it all correct -- power on one side RCA's and line level another.

It's normally at the ends of the RCas that go but I have seen where some installed have put them right under where feet go and they break and wear.

sim08u · 25-06-2012, 03:40 PM

is the head unit Pioneer?

BrownDog · 25-06-2012, 07:47 PM

I have that problem with my sub, haven't been bothered to fix it yet, but you can put on a low pass filter and that removes the problem, however it does remove all the high frequinces, you could just leave it and pretend its a supercharger

sim08u · 27-06-2012, 12:22 PM

LOL supercharger... I was told by my cousin that with Pioneer head units if you don't plug in the power last you get that engine noise...

06-04-2012, 06:27 PM	#1
Mazdaboy Junior Member Join Date: Feb 2012 Location: Australia Car: 1996 Mazda 323 BA Astina Posts: 5 View Photos By: Mazdaboy	Stereo sound issues Hey all. So I have a question that I'm not sure if anyone has an answer or if its been asked before. I have pulled out and re-installed my stereo system like 10 times, I've rewired over and over and I don't use any of the origanal wiring for the sound system except power, accessory and earth. ISSUE: When I start the car I get a high pitch whistle through my speakers and it gets louder as the rpm climbs up. Any ideas? Help is much needed, due to its doing my head in. Cheers. BTW its a "96" BA 323 Astina hatch.

06-04-2012, 07:05 PM	#2
Ben Senior Member Join Date: Jun 2011 Location: Sunshine Coast Car: MPS Posts: 1,939	Its a ground problem. Generally its between the stereo and a amp if you run the power cables with the stereo cables together. Your meant to run the cables on the opposite side of the car... However, you can buy a ground loop isolator and it will fix it... There about $20ish from jb. Or find a better ground source... Last edited by Ben; 06-04-2012 at 07:10 PM.

06-04-2012, 08:20 PM	#3
Jastel Junior Member Join Date: Apr 2009 Location: Newcastle NSW Car: 97 BA 323 Astina Hatch Posts: 211	I agree. I always run the power cable and RCA leads down opposite sides and the speaker wires down the middle. __________________ --------------------------------------------------- 1997 BA 1.8 Astina Hatch

07-04-2012, 12:41 AM	#6
Drift Thorpey Junior Member Join Date: Aug 2011 Location: Radelaide's WestSide Car: 89 Astina BG DOHC Posts: 172	Pretty much what xeon said, but go to the earthing bolt that the battery uses for a separate ground that should remove any hissing you get. __________________ Ashlee The White

25-06-2012, 03:40 PM	#9
sim08u Junior Member Join Date: Feb 2012 Location: Sydney Car: Mazda SP20 Posts: 240	is the head unit Pioneer? __________________ Hustle and Flow

06-04-2012, 09:03 PM	#5
phildough Banned Join Date: May 2006 Location: Brisneyland, Queensland Car: 2002 Mazda Frankenstina Posts: 2,868 View Photos By: phildough	You can also run an extra earth return from a nice clean bolt to the earth terminal. This is a must as every wire off the positive terminal should have an equal sized one on the negative. Another way of fixing it is all car stereo items run a common earth point. Amp and headunit all earthed to the same spot.

07-04-2012, 07:02 AM	#7
Mazdaboy Junior Member Join Date: Feb 2012 Location: Australia Car: 1996 Mazda 323 BA Astina Posts: 5 View Photos By: Mazdaboy	Thanks for the help guys. All though my power wire speaker wire and RCA are all separate until they get to the amp that's where they all meet up and I just ground the amp to a bolt in the back of the car. But if what your saying is right I'll try that. After all I have all the equipment to do them all and my loop issolator is on its way

07-04-2012, 08:12 AM	#8
rodhog Senior Member Join Date: May 2005 Location: Sydney Lakemba Car: mx-6 626 Gs300 Maz2 was 95 KF BA-HT Posts: 2,024 View Photos By: rodhog	Sometimes you also get it where poor quality RCA's are used. Like it's been said ground loop. THe grounding of the RCA's is poor can also give this effect, I've seen it on some installed where they have done it all correct -- power on one side RCA's and line level another. It's normally at the ends of the RCas that go but I have seen where some installed have put them right under where feet go and they break and wear.

25-06-2012, 07:47 PM	#10
BrownDog Senior Member Join Date: Jan 2012 Location: Beachmere Car: 1997 BA "The Red Baron" Posts: 704	I have that problem with my sub, haven't been bothered to fix it yet, but you can put on a low pass filter and that removes the problem, however it does remove all the high frequinces, you could just leave it and pretend its a supercharger

27-06-2012, 12:22 PM	#11
sim08u Junior Member Join Date: Feb 2012 Location: Sydney Car: Mazda SP20 Posts: 240	LOL supercharger... I was told by my cousin that with Pioneer head units if you don't plug in the power last you get that engine noise... __________________ Hustle and Flow