Welcome to the North American Subaru Impreza Owners Club Saturday April 25, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC General > Car Audio, Video & Security

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 09-15-2001, 09:37 PM   #1
RSser
Scooby Newbie
 
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
Vehicle:
1999 Impreza RS
silver

Default Another grounding problem and Alpine

The deal is: Alpine amp mounted in trunk on wood, power lead run down middle of car, RCA's run down passenger side, other speaker wires run down their corresponding sides, ground from amp to rear shock tower, additional ground run fron HU case to amp and then to rear shock tower. I have noise in rears. I switched the RCA's at the amp and the noise switched also. Do I have an amp problem? Noise is both ignition popping and alt. whine. The amp is a little over a year old and has been making this noise since new, but it was a hasty install and I just let it go until I could play with it.
* Registered users of the site do not see these ads.
RSser is offline   Reply With Quote
Old 09-15-2001, 10:19 PM   #2
mitch808
Scooby Specialist
 
Member#: 10228
Join Date: Sep 2001
Vehicle:
2002 Subaru WRX

Default

Well make sure that your RCA cables are SHEILDED. On top of that, you HAVE to grind or sand down the area your bolting down the ground to, it should be bare metal. If not you'll get noise in your system.
mitch808 is offline   Reply With Quote
Old 09-15-2001, 10:34 PM   #3
RSser
Scooby Newbie
 
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
Vehicle:
1999 Impreza RS
silver

Default

I grounded to the threaded bolt that sticks out of the top of the shock tower. There are three of them available.
RSser is offline   Reply With Quote
Old 09-15-2001, 10:48 PM   #4
mitch808
Scooby Specialist
 
Member#: 10228
Join Date: Sep 2001
Vehicle:
2002 Subaru WRX

Default

Quote:
Originally posted by RSser
I grounded to the threaded bolt that sticks out of the top of the shock tower. There are three of them available.

Thats okay to a point, I'll get into that later. Usually, alternator whine is caused by poor quality/NON-shileded RCA cables.

Back to your bolt grounding technique... That is still not enough. Did oyu use a eyelet crimp? Or a spade type crimp for attaching to the bolt? The mojority of the surface contact will come from the nut and car chassis and not the bolt. Most nuts are painted or coated with some type of anti-rust coating. So that leaves removing the paint on the car as a better option.

I am not giving a definitive fix, just my thoughts on how to fix it. As I am a bit of a audio nut.
mitch808 is offline   Reply With Quote
Old 09-16-2001, 01:09 AM   #5
RSser
Scooby Newbie
 
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
Vehicle:
1999 Impreza RS
silver

Default

I used an eyelet crimp type. I filed the eyelet as well as both surfaces of the two nuts. I ran one nut down on the post, put the eyelet on then tightened the other nut down on the eyelet. Are you saying that it is better to go to a place where paint is scrubbed off? I have tried grounding to three different places; one at bottom of rear deck where I used an existing 6mm threaded hole ( I think it was for a trunk light attachment), one through the drain plug under the spare tire and to the tow hook ( I think this was to long), and the last was the shock tower. All with just about the same results. In your opinion, do I have amp problems?
RSser is offline   Reply With Quote
Old 09-16-2001, 10:49 AM   #6
travman733
Scooby Specialist
 
Member#: 5649
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Kalamazoo, MI
Vehicle:
2002 WRX wgn bl stg2
(sold)'93 Impreza L Sedan

Default

Same problem here...although now I can hear the problem through the fronts as well. I moved my ground to yet another location and the problem got worse. I bought a stiffening cap right when I purchased the amp, so I'm going to try installing that and see if it helps filter out the noise.
travman733 is offline   Reply With Quote
Old 09-16-2001, 12:42 PM   #7
RSser
Scooby Newbie
 
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
Vehicle:
1999 Impreza RS
silver

Default

Stiffening cap? explain please.
RSser is offline   Reply With Quote
Old 09-16-2001, 03:22 PM   #8
Alpine Sube
Scooby Newbie
 
Member#: 1805
Join Date: Jul 2000
Location: M'head, MA
Vehicle:
2000 2.5RS
Silver

Default

If I were you I wouldn't run my power cable up the middel of the car. With the drivetrain and all the different electronics that are in the middle of the dash. I've always done power on the drivers side and RCA's on the passenger. I'm not sure where our CCM is on the car but make sure to keep the RCA's away from that to.
MATT
Alpine Sube is offline   Reply With Quote
Old 09-16-2001, 04:53 PM   #9
travman733
Scooby Specialist
 
Member#: 5649
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Kalamazoo, MI
Vehicle:
2002 WRX wgn bl stg2
(sold)'93 Impreza L Sedan

Default

Hm...I never really thought about that, but now I have an even bigger problem, so this'll have to wait. The install of the turbo timer did not go nearly as planned whatsoever!
travman733 is offline   Reply With Quote
Old 09-16-2001, 08:14 PM   #10
RSser
Scooby Newbie
 
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
Vehicle:
1999 Impreza RS
silver

Default

MATT, I understand what you are saying, but, it seems to me that there are a lot more wires in the kick panels on both sides. Where I ran the power cable through the firewall, there seems to be very little wiring. There is almost no wiring in the center consul.
RSser is offline   Reply With Quote
Old 09-17-2001, 12:30 AM   #11
akcel
Scooby Specialist
 
Member#: 10268
Join Date: Sep 2001
Chapter/Region: SCIC
Location: San Diego
Vehicle:
gc8 I ride ride 24s
with the top down low.

Default

what i used to ground my amp was my spare tire...the center thing that tightens to hold the spare in place is bare metal and cunducts perfectly...also i have a real amp...autotek...with built in noise filters....i dont have any engine noise...also you may want to look into a pioneer organic deck..or any kind of pioneer deck..they have great noise filters on all of their high end decks..

-akcel™
akcel is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
head gasket issue. and yes, another misfire problem. rathead Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 2 10-29-2007 12:41 PM
Another grounding mod Kraziken Legacy Forum 16 04-22-2006 12:13 AM
another grounding mod success story! shipjumper New England Impreza Club Forum -- NESIC 4 08-21-2005 02:14 AM
Alpine IVA-D300, Alpine Navigation, and Alpine 12 Disc changer WRXin04 Private 'For Sale' Classifieds 12 08-04-2005 09:59 PM
Grounding Mod and Possible Heat Problem Meat Electrical & Lighting 3 08-11-2003 03:54 PM


All times are GMT -4. The time now is 09:06 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.