EM TuningChris Nott
Results 1 to 8 of 8
  1. #1
    enda1's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Jan 2006
    Location
    Ireland
    Posts
    439

    S6 "engine Noise" after amp install

    Folks.

    I just finished installing new kit as below in my 96 Audi S6.
    I am running this with my exisitng Sony head unit with 4 channels out , 2 Front and 2 rear
    Amp JBL GTO 540
    Front Components 5.25 JBL P560C
    Rear 6x9 JBL P963
    Wiring kit FLI Audio AK10 10AWG.
    New speaker cable.

    I wired the +ve to the battery (under the rear seat) and the -ve to the chassis mount of the ABS unit (under the rear seat)

    With the ignition off the sound is great but with the engine running I get a speed related whining noise through all the speakers.

    Did a bit of checking and will try the following.
    Get a better earth point
    Reroute the power cables away from the RCA signal cables.

    If this doesn't work can someone suggest a suitable noise suppressor to fit in line with the positive cable to get rid of this interference
    Last edited by enda1; 2nd October 2009 at 09:58.
    Enda1

    96 S6 2.3T
    99 A6 1.8T SE
    93 80 2.0 (gone)
    93 Kawasaki ZZR600

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    Broken Byzan's Avatar
    Photographic Moderator

    Status
    Offline
    Join Date
    Apr 2004
    Location
    Cardiff, United Kingdom
    Posts
    12,523

    My Social Networking

    Follow Broken Byzan On Twitter Add Broken Byzan on Facebook Add Broken Byzan on Google+ Visit Broken Byzan's Youtube Channel
    Change the earth, it is very unlikely interference is causing it.

    You didnt power the amp up with no RCAs connected and then plug them in did you? That can blow earth tracks in the HU causing all sorts of issues.

    I would say though 95% earth problem

  4. #3
    alijames's Avatar
    5th Gear

    Status
    Offline
    Join Date
    Feb 2008
    Location
    Oxford
    Posts
    1,017
    I had the same problem when I replaced the Bose amp in my S3 with an Alpine 5 channel, even with the earth connected directly back to the Battery, so that was not the problem.

    My solution was to install ground loop isolating transformers into the RCA connections.

    I got mine from a local Car Audio place, but Maplin do some :

    http://www.maplin.co.uk/Free_UK_Deli...ator_33172.htm

    They are not the smallest bits of kit, but work well for me...

    Cheers,
    Alistair

    "Why don't you listen to something really classical, like Mozart, Mendelssohn or Motorhead?"
    Arnold Rimmer, 1988

    Commuting & Weekend Fun:
    Yamaha YZF-1000R Thunder Ace in Blue/Black

    Practical Alternative (Still fun though!!):
    S3 2002/51 AMK Silver, Symphony II + Bose + xCarLink + AndyMac Stealth Sub, Metallic Mirrors, Heated Black Leather, Cruise control.

  5. #4
    enda1's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Jan 2006
    Location
    Ireland
    Posts
    439
    Bryzan I conneted the the RCA and powered up last of all so this shouldn't be the problem, also the sound is crystal clear with the engine off.

    Alijames. if nothing else works i'll give these a try. I assume you install at the amp end of the RCA and not the head unit end
    Enda1

    96 S6 2.3T
    99 A6 1.8T SE
    93 80 2.0 (gone)
    93 Kawasaki ZZR600

  6. #5
    Moderator

    Status
    Offline
    Join Date
    Jun 2003
    Location
    World of my own
    Posts
    9,813
    If the earth is not the issue then I'd upgrade the RCA's. You don't say what RCA's you are using but there are some pretty badly screened ones out there. Also what earth have you used at the HU. If it's just the stock earth from the Audi loom then I'd add a proper chunky one from the chassis to the chasis of the HU as the Audi one is pretty poor. Don't bother running the RCA's away from the power as this is very unlikely to be the problem.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  7. #6
    enda1's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Jan 2006
    Location
    Ireland
    Posts
    439
    The RCA's are the ones that came with the FLI wiring kit. I am using the stock earth at the head unit so I will look at changing this as well.
    Enda1

    96 S6 2.3T
    99 A6 1.8T SE
    93 80 2.0 (gone)
    93 Kawasaki ZZR600

  8. #7
    Moderator

    Status
    Offline
    Join Date
    Jun 2003
    Location
    World of my own
    Posts
    9,813
    Right, so they are probably garbage, but start with the earths.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  9. #8
    enda1's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Jan 2006
    Location
    Ireland
    Posts
    439
    I tried a better earth for the amp and it was no better. I didn't have time this weekend to take the centre console of to run a better earth for the head unit so I treid the ground loop isolators alijames suggested and it solved the problem without any discernible change to the sound quality so I'll stick with them until I get the time to earth the head units
    Enda1

    96 S6 2.3T
    99 A6 1.8T SE
    93 80 2.0 (gone)
    93 Kawasaki ZZR600

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO