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Thread: What do you think the problem is here?

  1. #1
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    What do you think the problem is here?

    Alright so I've had my Kicker S12L7 for a while now. I've had it hooked up on a JBL mono amp and it's had this problem ever since I hooked it up. I had my passenger seat out yesterday to replace the seat cover and decided to mess with the amp (it is under the passenger seat).

    The problem is that I can't set the boost all the way up because the sub outputs very fast/loud pulsating bass until I turn it down again. I hooked up my ipod to it with an aux adapter and was able to turn the boost all the way up without this happening.

    I've narrowed it down to the head unit or the audio cable. Which do you think is the culprit? What do you think is the easiest/cheapest way to fix it?
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  2. #2
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    is there reason u don't have confidence in the cabling ?

  3. #3
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    Not really. Just the RCA Wire is oldish, but its stinger. It sits a little loose on the connectors on the amp.
    '93 Toyota Celica - First Car PC install
    Current System Specs:
    ZOTAC GF8200-C-E AM2+ GF8200
    AMD Athlon 64 X2 3800+
    1 GB DDR2 667
    LITE-ON DL-8ATS Slot-Load
    750 GB Seagate SATA HDD
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    19" Hyundai Monitor

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    Quote Originally Posted by cjrokke View Post
    . I hooked up my ipod to it with an aux adapter and was able to turn the boost all the way up without this happening.
    By that do you u mean you plugged it directly into the amp, or used an aux adapter to go into the head unit? If you did it right into the amp then as a test i would suggest plugging the ipod in at the end of the cable that the head unit plugs into and see how it acts.

    You could also try getting a new wire (cheaper than a new head unit) and just run it from the HU to the amp temporarily just across the interior of the car without routing it nicely as you normally would and see if that make a difference as well.

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    Quote Originally Posted by bratnetwork View Post
    By that do you u mean you plugged it directly into the amp, or used an aux adapter to go into the head unit? If you did it right into the amp then as a test i would suggest plugging the ipod in at the end of the cable that the head unit plugs into and see how it acts.
    Thats a good idea. I think I'll try that next. But now I need to find some f/f RCA adapters...
    '93 Toyota Celica - First Car PC install
    Current System Specs:
    ZOTAC GF8200-C-E AM2+ GF8200
    AMD Athlon 64 X2 3800+
    1 GB DDR2 667
    LITE-ON DL-8ATS Slot-Load
    750 GB Seagate SATA HDD
    250W PSU
    19" Hyundai Monitor

  6. #6
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    Just out of curiosity. has anyone ever tried a noise suppressor between the amp and HU? If its not my RCA cables, will one of those work?
    '93 Toyota Celica - First Car PC install
    Current System Specs:
    ZOTAC GF8200-C-E AM2+ GF8200
    AMD Athlon 64 X2 3800+
    1 GB DDR2 667
    LITE-ON DL-8ATS Slot-Load
    750 GB Seagate SATA HDD
    250W PSU
    19" Hyundai Monitor

  7. #7
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    I tried a couple of noise supressor/ground loop boxes between my motherboard and my power amp. They actually picked up ambient signals and noise until the motherboard and amp kicked in. I eventually removed them and my whole system is quieter now.

    They were cheapies though, so I suppose you get what you pay for.

    VegasGuy

  8. #8
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    sounds like you got a ground loop

    first, turn the bass boost all the way off/down-- this is doing nothing but artificially adding to the sound, and could hurt your sub(s) by over exerting them in frequncies that they cannot play properly at that level.

    second, check all power connections--make sure that you have a good solid ground--that you have thoroughly sanded the paint off the area that the amp ground is bolted. make sure that all power connections at the radio and at the amp are solid and corrosion free.

    GLI's(ground loop isolators) are both made for rca inputs and the power inputs-- overall though, they are hit or miss- sometimes they will completely remove the noise, other times, they don't work at all-the only way to know is to try...

    but, they are still refered to as 'band-aids'-- meaning that they are only covering up the real problem, and not really fixing it... so any change in the system later might cause the issue to show up again...

    the only tried and true way to fix a humming/buzzing is to keep trouble shooting the connection until the noise dissapears.

  9. #9
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    Another thing to check - common in a lot of lower-quality amplifiers - is your head unit earthed to the car, or into the factory wiring loom? I have seen several "pulsating subs" problems caused by the deck not having a good enough ground point.

    * Always connect the head unit ground to some metal in/behind the dash - it won't hurt, but often helps.

    - another note - ground loop isolators. I haven't found a good one yet - they all affect low and/or high frequency response.
    MacMini in an Alfa? - Why not!

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