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Thread: [FIXED] Amp wiring problem, sub cuts out and amp goes into protect mode HELP!

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    Exclamation [FIXED] Amp wiring problem, sub cuts out and amp goes into protect mode HELP!

    I have a ford taurus 2005 with a p1800.4 (4 channel crunch amplifier) and a Hifonics 12" 12d4 subwoofer in a sealed box, when I first intsalled it, it was fine now it cuts out and amp goes into protect mode, my ground is fine ive tried wiring in bridged unbridged, parrallel series, u named it ive tried it.

    -power wire 8 gauge
    -ground 8 gauge
    1 12" Hifonics sub
    2 sony xplod 5x7 rear speakers (fronts arent hooked up)

    If somebody could please help me out, is there something simple im missing?????

  2. #2
    FLAC WuNgUn's Avatar
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    Are you running the sub and the 5X7's off 2 channels? i.e. stereo drivers and bridged sub? If so, this is probably too much load for the amp...
    That, or you have a bad wiring connection at the speaker/amp...make sure you dont have any frayed wires shorting out.

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    i have the sub bridged on one channel (1/2) and the spekaers in channels (3/4) unbridged obviously, connections are fine, I ran a volt meter and when the amp is on and playing its 12.35, its at very low volume of course because it still cuts out. that is normal isnt it, here is a text diagram of the wiring

    Terminal (1/2) (Subwoofer) (*-*)(+)(-)(*+*) <---bridged
    Terminal (3/4) (Speakers) (*-*)(*+*)(*-*)(*+*) <---- single channel mode

    4 channel amp

    any other help? i feel like ive tried all solutions.. I appreciate your responses

  4. #4
    MySQL Error soundman98's Avatar
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    what is the final load of the sub at the amp?

    what have you checked with a dmm?

    edit: missed the 2nd post...

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    http://a248.e.akamai.net/pix.crutchf...4-ohm_mono.jpg

    Except its a 4 channel amp, ive tried wiring it different ways too

  6. #6
    Constant Bitrate thewizard's Avatar
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    You can't run a four channel amp in the configuration that you are trying to run. You can the bridge the four channels to two but thats it, you cannot run it as a 3 channel. This is your problem.
    Data911 M5 system
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    Digital Design sub woofers
    3 runs of 0 gauge wire

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    MySQL Error soundman98's Avatar
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    you have 2 options-- either wire the sub to only the left channel (i have used some small 35x 2 channel amps and subs setup in my brothers cars this way..) (most bass is on the left/mono channel), or get a different amp...

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    thewizard, i dont mean to correct you but i had this setup the same in my room and it ran fine and stable, it just does not like my car, it even says and shows diagrams in the amp manual that I can bridge a sub and run the 2 speakers for the 3/4 channels. it is a bridgable amplifier,

    and soundman, ive tried it on just the left channel and it does the same thing cuts out into protect mode, ive even tried it with all terminals without any speakers connected, just the sub was same thing.

  9. #9
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    Easy answer...

    You didn't match the sub's impedance to the amp's bridged impedance. The amp can drive a minimum of 4 Ohms when bridged. That sub is either a 2 or an 8 and i'm guessing its a 2 if it went into protect.

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    Its best to keep discussion in the thread it started in, that way other forum members who have the same questions can benefit.
    Your PM:
    Quote Originally Posted by Chrizzzle
    hey so this is my sub it says its a dual 4 ohm

    http://www.sonicelectronix.com/item_...+HFi+12D4.html

    how do i match it up here is my amp also

    http://www.sonicelectronix.com/item_...h+P1800.4.html
    Dual voice coil means you have two 4 ohm loads but depending on how you wire them you either get 1 8ohm load or 1 2ohm load. Take a look here:
    http://www.crutchfield.com/S-Id7OCe6...fers_dual.html

    and if that doesn't clear things up let me know.

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