Question about Alpine Type-R SWR-1242D Car Subwoofer

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Help on 1 amp and 1 alpine srw-124d

Hey guys/gals i'm a new-b to this stuff . my swr-1242d has 2 4ohm connections on it ...something like this ( - 4ohm + - 4ohm +)......now my question is where do i connect (1) - wire and (1) + wire?
example #1. (-) 4ohm (+) - 4ohm +
example#2. (-) 4ohm + - 4ohm (+)
example#3. - 4ohm (+) (-) 4ohm +

the simbol ( ) in examples 1 through 3 represent where?.... i should place the speaker wire ..please help ..thanks

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  • 213mike Jun 08, 2008

    i'm trying to connect my alpine swr1242d 12" subwoofer in a sealed box....but i dont know where to connect the red + wire and the black - wire...on the woofer ..for it has 2 4ohm connections to it....please see above examples...thanks

  • JEFFSANDERS2 May 11, 2010

    i just got the alpine SWR-1242D dual ported box



    now im trying to bridge it. But it's different from the audiobahn subs



    instead of two channels each side of the subwoofer



    on this there is 4 channels on each side of the subwoofer



    ?How would you bridge this?



    diagram would be great

    please email at JEFFSANDERS24@YAHOO.COM

  • Christophe Thompson
    Christophe Thompson May 11, 2010

    what are you trying to do and how many are you trying to do it with and is this with amp or without amp need a little more info so we know that were on the same wave length

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  • 28 Answers

You have dual 4-ohm coils. 2 coils per speaker.using one speaker, if you take and run the postive from one coil and connect it to the negative of the other coil, then take a wire from your bridge channel on your amp and connect the positive to the the remaining positive on the one coil and connect the negative to the remaining negative on the other coil you will create a 8ohm load on the amp in bridged mode.

now this is the important part. The bigger the load on the amp the greater the wattage output to the speakers. This sucks the wattage out of the amp. Careful not to overload you amp. The setup above is safe for any amp. The following is for 2ohm stable amps only. The lower the ohm value 2, 4, 8 and so on, the greater the load on the amp.

connect the positive of one coil to the positive of the other. connect the negative of one coil to the other negative of the other coil. then take a wire from your bridge channel on your amp and connect the positive to the the positive on one coil and connect the negative to the negative on the same coil and you will create a 2ohm load on the amp in bridged mode.

Series = add the two ohm value
parallel= halve the ohm value

you can play with series and parallel together using more than one speaker setup.

Posted on Dec 10, 2008

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1 Answer

SWR-1242D wired at 4ohms


Hi!

Having to much power for a subwoofer is a veeeery good thing, it will provide a lot of control and quality sound to your sub.

But this sub is a dual voice coil at 2 x 4ohm so if you want to hook it up at 4 ohm u need a 2 channel amplifier running mono mode.

i dont recomend that you hook up in 4 ohm, its better to take some time adjusting the levels on the amp and the headunit.

This system has the potential to create a realy good bass sound if u tune it the right way.



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2 Answers

Wires


Hi Gott Mudd,

 

I can relate to feeling it in the bones. You got the stuff to do it.  You should try the Alpine MP3 head units with bass boost, those are bad to the bone.

 

Wiring: 

 

Amp to Speaker I like to use the code VC for Voice coil, and AO for Amplifier output.  Also + for positive.  If I say VC1-, I am referring to the first connector starting left to right on the Alpine Sub. Now I have not seen a Kicker KX1200.1 amplifier.  All I see are MRA, MRP, or PDX prefix on the part numbers. So take what I am saying as a guess. You may want to revisit looking at the model of the amp to be sure your giving the right information.

 

We are going for  2 Ohms. Paralleling the two subs, not the voice coils. The voice coils will be series.  Bridge the amp if necessary to get mono channel. only using AO+ and AO- for output.

 

AO+ to Sub1VC1+

AO+ to Sub2VC1+

Sub1VC1- to Sub1VC2+

Sub2VC1- to Sub2VC2+

AO- to Sub1VC2-

AO- to Sub2VC2- 

 

Set your Crossover to LPF

Adjust the bass gain down to lowest until you test.

Set the Frequencies to midrange between 40 and 100hz  

 

Your box can be ported or not. It depends on the space your have.  If you do not have much room, go Enclosed and build a box that the inside space is less than 1 cubic foot.  Make sure you give barely  enough clearance for the speaker to fit.  If you have room, Go with a box and vent it with a 3 inch Vent tube 10 inches long.  

Oct 15, 2007 | Alpine Type-R SWR-1242D Car Subwoofer

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