How do I wire my Alpine Type R SWR-124D 4ohm + 4ohm 12" subs? I have a 2 channel amp, with two outputs on the back of the sub box. I ran my wires correctly from the back of the sub box to the amp, but only one sub was firing. What is going on?

SOURCE: Need to build a ported sub box for my alpine swr-1222d subs x 2

Try going to Alpine web site, I think they have box building program as well that you just input your sub models into and it gives you blueprints for various types of enclosures. I know Rockford has one and a comparative attachment to compare equipt specs. Or if you call Alpine headquarters you may be able to get info that way, I once sweet talked a rep @ a demo vehicle I met doing some car shows that turned me on to a senior rep @ Korbon Trading the owners of Rockford Fosgate and they gave me specs for a 5 stage band pass box for some competition subs that was more intricate and detailed than anyone before that could find me, Won me first place in spl. Matching your box specs to your subs is crucial and the best specs are often kept a secret for demo competition vehicles! So ask around with some competition guys or other top experts if your real serious about your boooom.

SOURCE: what is the best box for 2 ALPINE SWR-1242D

Ported and tuned to around 37-40 hertz. After all displacement the box should be in the 2.2 cubic foot for sub and you will be very impressed. Build it yourself for optimum sound and output.

SOURCE: Amp for 12" Alpine Type R DVC 4ohm

i actually have 2 12" type s's and i did the same thing just wanted a cheap amp... i went on ebay and bought a pyramid 1600 super blue series amp..... its 1600 watts and ive also hooked it up to type r's and it POUNDS!!! ill copy and paste the website where i got mine from on ebay... if you tune it right it'll make it so you cant breathe inside your car......http://cgi.ebay.com/NEW-1600-WATT-PYRAMID-PB559X-Car-Audio-Amp-Amplifier_W0QQitemZ350169009069QQcmdZViewItemQQptZCar_Amplifiers?hash=item5187b30bad

SOURCE: help on 1 amp and 1 alpine srw-124d

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.