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    corruptedkid's Avatar
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    How do I bridge my amp?

    How do I bridge my new Amp to my JL Audio subwoofers? I dont need specific instructions but just a rough idea. Id ont really know what it means to "bridge it". So if someone could please help me, it would be greatly appreciated.
    Thanks
    ----Cody







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    Re: How do I bridge my amp?

    What amp do you have? and what sub? these are important things we need to give you an acurate answer.




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    Re: How do I bridge my amp?

    "Bridging" means combining 2 channels into one. You need a stereo amp that's designed to allow bridging both channels together. Instructions will be in your manual.



    dave
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    1999 Buick Park Ave Ultra
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    Re: How do I bridge my amp?

    Not trying to hijack the thread, but can 2 channels of a 4-ch amp be bridged for the sub while the other 2 are used for front speakers?




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    Re: How do I bridge my amp?

    Quote Originally Posted by OdieTRP
    Not trying to hijack the thread, but can 2 channels of a 4-ch amp be bridged for the sub while the other 2 are used for front speakers?
    yes!
    Last edited by rippinitup7; 11-30-2004 at 05:29 PM. Reason: im a jackass



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    Re: How do I bridge my amp?

    actually, on most amps yes u can do that. Just make sure the amp's description says something along the lines of "3-way ready" (2 channels for speakers + 1 bridged for sub = 3 channels)



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    One of my subs is inverted; it adds 10 DBs!

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    Re: How do I bridge my amp?

    It doesnt matter if it's three way ready. A four channel amp has four transformers in it. Just make sure you bridge 1&2 or 3&4. and use what ever isnt bridged for the other speakers.




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    Re: How do I bridge my amp?

    Are u talking about bridging multiple mono amps or a single amp.




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    Re: How do I bridge my amp?

    Alright, here comes part two. Will the bridged channels have a lower impedence, i.e. 2 ohms, while the other two channels stay at 4 ohms? If so the wattage will be at the 2 ohm rating going to the sub(s)? Does this also mean that there will be more distortion going to the sub? That's not a big deal since it's bass but I'm curious nonetheless.




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    maylar's Avatar
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    Re: How do I bridge my amp?

    Quote Originally Posted by OdieTRP
    Alright, here comes part two. Will the bridged channels have a lower impedence, i.e. 2 ohms, while the other two channels stay at 4 ohms? If so the wattage will be at the 2 ohm rating going to the sub(s)? Does this also mean that there will be more distortion going to the sub? That's not a big deal since it's bass but I'm curious nonetheless.
    Bridging doesn't change the impedance of the load - that's determined by the speakers or subs. But, the minimum impedance (lowest ohms) the amp can handle usually doubles when you bridge an amp. Like a 2 ohm stereo amp usually can handle no less than 4 ohms bridged.



    dave
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    Amp: PPI Phantom 900.4
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    Re: How do I bridge my amp?

    Quote Originally Posted by johnecon2001
    It doesnt matter if it's three way ready. A four channel amp has four transformers in it. Just make sure you bridge 1&2 or 3&4. and use what ever isnt bridged for the other speakers.
    Transformers? lol. No..

    Amps must be designed to be bridged. One of the channels must be inverted 180* internally so that the ouputs will add together. It's so common though that I doubt any commercial amps today don't have that feature.



    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

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    Re: How do I bridge my amp?

    oh.. hehe




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    Re: How do I bridge my amp?

    ok heres what I have.

    SUBS: 2 JL Audio 10W0-8 10" 8 ohm 125 watts sub woofers.

    AMP: Eclipse EA2212 50Wby2 Amp Variable Crossover.

    hope that helped!
    Thanks
    ---Cody




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    maylar's Avatar
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    Re: How do I bridge my amp?

    Yes, that amp is bridgeable. Put the two subs in parallel (plus to plus, minus to minus) and connect them to the amp in bridged mode. Usually that's from the plus output of one channel and the minus output of the other.



    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

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    Re: How do I bridge my amp?

    +-+- bridging would be connecting the positive wire of your sub to that first plus and the negative wire to the SECOND minus....basically youll have the wires connected where the arrows are: ---->+-+-<-----




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