Closed Thread
Results 1 to 9 of 9

Reload Thread: ground loop isolator

  1. #1
    Jnoble's Avatar
    Jnoble is offline BluntMaster



    Join Date
    Sep 2003
    Location
    Modesto, ca
    Age
    34
    Posts
    23
    Post Thanks / Like
    Mentioned
    0 Post(s)

    ground loop isolator

    I purchased 2 ground loop isolators to clear up my road noise 1 from a shop and one from radioshack. I tried running the isolator from RS between my crossover and my high amp but it did not help. The RS isolator had two male RCA plugs so w/o a coupler I can't run it between the deck and crossover. I got the 2nd isolator because it had female and male RCAs. I put this one in line between the deck and crossover and it cut out all my bass. The tech at the store told me it shouldn't that maybe it was lowering my input. So I ran a second rca from my deck to my high amp with the isolator on it and it got rid of the road noise but there is absolutley no bass coming from my highs now, w/o a crossover or filter just the isolator. It's probabaly cut off around 1000Hz.
    My question is: Is it possible the isolator has cut out the bass and if so where can I get an isolator without the filter?

    thanks for the help!



    BluntMaster
    GARCIAyVEGA


    96' Buick Regal Custom
    HU: ALPINE CDA-9807
    MTX X01A Crossover
    Door: Orion Cobalt 100.2; Kicker DX-525
    Rear: Orion Cobalt 100.2; Pioneer TS-A6960R
    Rear S: Orion Cobalt 150.2; 2 10" 500W Earthquake Tremors
    Sub Output: MTX Thunder 275X; 1 12" RF Punch HE




  2. #2
    Join Date
    Sep 2003
    Location
    St. Louis
    Age
    30
    Posts
    110
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: ground loop isolator

    All that should be in any ground loop isolators is essentialy a electromagnet that blocks out a dc signal therefore eliminating noise, In reality, ground loop isolators have been known to degrade the signal causing your lower freqs to not transmit properly. I do not have a scientific explanation for why that happens, nor a solution except to try and go a different route to get rid of alt whine.




  3. #3
    maylar's Avatar
    maylar is offline Electrical Weenie



    Join Date
    Jan 2002
    Location
    Connecticut
    Age
    62
    Posts
    3,418
    Post Thanks / Like
    Mentioned
    13 Post(s)

    Re: ground loop isolator

    Uh.. no.

    A ground loop isolator uses coupling capacitors that allow AC (audio) to pass, but block the DC path. A capacitor is also a hipass filter, depending on its value and the value of the impedance it sees as a load. Your case sounds a bit extreme, but it's quite possible to lose low frequencies through it if the load impedance you plug it into is low.

    Try this:

    Make your own ground isolators. Get a pair of short M-F RCA wires from RS. Cut them in half. Strip the insulation back, and reconnect the center wires but not the shield. Tape them up nice and secure.

    That's what I'm using. It's only a partial isolator, since it doesn't isolate the HU preout driver impedance, but it's enough to kill most alternator whine without losing frequency response.



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

  4. #4
    Jnoble's Avatar
    Jnoble is offline BluntMaster

    Threadstarter


    Join Date
    Sep 2003
    Location
    Modesto, ca
    Age
    34
    Posts
    23
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: ground loop isolator

    Quote Originally Posted by maylar
    Try this:

    Make your own ground isolators. Get a pair of short M-F RCA wires from RS. Cut them in half. Strip the insulation back, and reconnect the center wires but not the shield. Tape them up nice and secure.

    That's what I'm using. It's only a partial isolator, since it doesn't isolate the HU preout driver impedance, but it's enough to kill most alternator whine without losing frequency response.
    I made the isolator but it didn't get rid of the road noise. Do you think if I get a new alpine with 4v pre-outs it will fix the problem?



    BluntMaster
    GARCIAyVEGA


    96' Buick Regal Custom
    HU: ALPINE CDA-9807
    MTX X01A Crossover
    Door: Orion Cobalt 100.2; Kicker DX-525
    Rear: Orion Cobalt 100.2; Pioneer TS-A6960R
    Rear S: Orion Cobalt 150.2; 2 10" 500W Earthquake Tremors
    Sub Output: MTX Thunder 275X; 1 12" RF Punch HE

  5. #5
    maylar's Avatar
    maylar is offline Electrical Weenie



    Join Date
    Jan 2002
    Location
    Connecticut
    Age
    62
    Posts
    3,418
    Post Thanks / Like
    Mentioned
    13 Post(s)

    Re: ground loop isolator

    No guarantee that a new HU will solve the problem. Have you tried running the HU directly to the amp (no eq)?



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

  6. #6
    Jnoble's Avatar
    Jnoble is offline BluntMaster

    Threadstarter


    Join Date
    Sep 2003
    Location
    Modesto, ca
    Age
    34
    Posts
    23
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: ground loop isolator

    I tried everything I could think of. I swapped wires, amps, crossover, ground locations. Finally I went out and bought a new Alpine with 4v pre-amp outputs, (needed a new deck anyway). And lety me tell you... if you are en experienced installer (5-10 years) and the problem is obvious and the answer is not. Go out and spend $300 bucks on a new alpine and all your problems will be solved (assuming you know what you are doing in the trunk). My new deck fixed problems I didn't even know I had. It cleared up low end road noise I thought was just distortion, it cleared out all the high freq. noise w/o using an isolator. Plus the overall clarity of alpine, I forgot how nice they really are. I know I said this before but this time for real:
    ALPINE is the only deck I will put in my car!!!!!!!

    oh and btw, I've had just about every major brand HU and the only two I've never had any problems with road noise are alpine and pioneer. The worst have been Kenwood and Sony.



    BluntMaster
    GARCIAyVEGA


    96' Buick Regal Custom
    HU: ALPINE CDA-9807
    MTX X01A Crossover
    Door: Orion Cobalt 100.2; Kicker DX-525
    Rear: Orion Cobalt 100.2; Pioneer TS-A6960R
    Rear S: Orion Cobalt 150.2; 2 10" 500W Earthquake Tremors
    Sub Output: MTX Thunder 275X; 1 12" RF Punch HE

  7. #7
    80_Cutlass_mn's Avatar
    80_Cutlass_mn is offline What needs to be here?



    Join Date
    Nov 2002
    Location
    Anderson,Al
    Age
    28
    Posts
    1,809
    Post Thanks / Like
    Images
    9
    Mentioned
    0 Post(s)

    Re: ground loop isolator

    Well thats just kenwood and sony for ya. Kenwood's and Sony's arent the best in the group. The only way I would recommend any regular kenwood h/u or sony h/u is if someone was thinking about getting a pos pyle, pyramid, legacy, etc etc. h/u.



    Arctic White 1995 Camaro 3.4L

    Hifonics BX2005D- 12" IA Death Penalty
    Premier prs-x220 - MB Quart DSD213 components
    Pioneer DEH-P7600MP - Scosche 4 Ga. wiring kit

    Aol Instant Messanger: CamaroMN1995

  8. #8
    Pac-Audio's Avatar
    Pac-Audio is offline Junior Member



    Join Date
    Sep 2003
    Location
    CA
    Posts
    2
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: ground loop isolator

    Ground loop isolators should be transformer based, not capacitors. Our SNI-1 is transformer based and has a 1:1.5 ratio. If you hook it up backwards it will reduce the signal which people complain that they lose bass.




  9. #9
    maylar's Avatar
    maylar is offline Electrical Weenie



    Join Date
    Jan 2002
    Location
    Connecticut
    Age
    62
    Posts
    3,418
    Post Thanks / Like
    Mentioned
    13 Post(s)

    Re: ground loop isolator

    Quote Originally Posted by Pac-Audio
    Ground loop isolators should be transformer based, not capacitors. Our SNI-1 is transformer based and has a 1:1.5 ratio. If you hook it up backwards it will reduce the signal which people complain that they lose bass.
    Interesting. What is the frequency response and impedances of the transformers?



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

Closed Thread

Similar Threads

  1. Ground Locations In 98 Civic?
    By nosaj070 in forum Wiring, Electrical and Installation Help
    Replies: 4
    Last Post: 09-03-2003, 09:06 PM
  2. Amp ground question
    By Jbarbier in forum Amplifiers
    Replies: 12
    Last Post: 08-22-2003, 09:22 PM
  3. How should I ground my amp
    By iceteebone in forum Wiring, Electrical and Installation Help
    Replies: 5
    Last Post: 08-14-2003, 04:52 PM
  4. Ground
    By shoRunner in forum Wiring, Electrical and Installation Help
    Replies: 4
    Last Post: 08-10-2003, 07:04 PM
  5. Ground Zero's....
    By cFlatt in forum Subwoofers
    Replies: 10
    Last Post: 07-30-2003, 05:04 PM

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts

1e2 Forum