How do i properly bridge a 4 channel amp to a 2 channel? | Ford Escort Owners Association (FEOA)

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How do i properly bridge a 4 channel amp to a 2 channel?

Discussion in 'ICE (In Car Entertainment)' started by mrchyzy16, Jul 14, 2011.

  1. mrchyzy16

    mrchyzy16 New Member

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    Hey, I think I kind of have it figured out but I just want to make sure Im doing it the correct way. First off the amp is a JL e4300. Its 45x4 or 90x2. Now Im doing this so I can run more power to my front components and just use the headunit's power for the rear fill. Do I connect the first speaker to the positive on the first channel and the negative on the second channel? And so on for 3 and 4? If that is correct then how do I go about it when I adjust the gains? Do I just keep them at the same voltage? I never bridged an amp before so any help would be great. Thanks
    mrchyzy16, Jul 14, 2011
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  2. mrchyzy16

    mrchyzy16 New Member

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    Ok so I did a little more reading. Now from what I read it sounds like I am only running one pair of rca's to my hu connected to front. My rear wont be connected on the hu. Then I have to run two y cables from the other ends to the amp? Does that sound right? Also, im still confused on how to go about setting the gain controls when im bridging the channels.
    mrchyzy16, Jul 14, 2011
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  3. neuspeedescort

    neuspeedescort Moderator Staff Member

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    look at JL's web site.


    NEUMAN
    neuspeedescort, Jul 14, 2011
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  4. mrchyzy16

    mrchyzy16 New Member

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    I am looking right at the manual and it is just confusing me a little bit. I would prefer someone that has done this before to give me some insight.
    mrchyzy16, Jul 14, 2011
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  5. neuspeedescort

    neuspeedescort Moderator Staff Member

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    that owners manula should state the maximum voltage the channel can produce as output to be formulated to watts. you can do this with a normal voltage tester but unless you are in the perfect world its not going to be 100% accurate. teh best way to tune and the only way i tune gains is with an o-scope. any good shop should have one of these.

    as for the rca's yes. a simple y adapter is all you need.

    bridging is printed on teh side of teh amp. jsut above or below the speaker terminals.


    NEUMAN
    neuspeedescort, Jul 14, 2011
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  6. mrchyzy16

    mrchyzy16 New Member

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    Ok so I set the gains to the same voltage for all the channels then. This will be stereo bridged correct? not mono?
    mrchyzy16, Jul 14, 2011
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  7. Green91Goblin

    Green91Goblin New Member

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    Mrchyzy, Neuman here is our resident audio guru. I would take everything he says at a pretty high regard (unless he doesn't like you). He's helped me out of a jam or two. And yes, set both gains matching. As far as the stereo/mono, i dunno.
    Green91Goblin, Jul 21, 2011
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  8. mrchyzy16

    mrchyzy16 New Member

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    Yea I kinda figured on the gains. I have bridged a amp before but that was for a sub. I have never done a 4 channel amp to be used by 2 speakers. I thought I read somewhere that the reason for the splitting of the rca's into a y adapter was to get a stereo output. I just wanted to make sure that I was doing it correctly. Thanks
    mrchyzy16, Jul 21, 2011
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