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How to Wire a Dual 4 Ohm Subwoofer in Parallel for a 2 Ohm Load

Picture of How to Wire a Dual 4 Ohm Subwoofer in Parallel for a 2 Ohm Load
This is a basic way in which you can wire a dual 4 ohm subwoofer to a 2 ohm load.

If you are looking to get the most power out of your amplifier for your sub, this is one of the best ways to wire your subwoofer. It is a traditional method of wiring that works very well. The sub will be wired in "parallel" to achieve this impedance (ohm).
 
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Step 1: Gather The Necessary Materials and Prepare the Box

Here is the list of items that are used for this simple installation.

1 x Kicker CVX 12 Subwoofer

1 x Kicker 12 AWG Speaker Wire

1 x Kicker 750 Watt Monoblock Amplifier

1 x 20 oz. bag of Poly-Fil FiberFill

1 x Vented Sonic Sub Box Enclosure

1 x Wire Stripper/Crimper

Screws

Power drill

1 x Kicker Subwoofer Grille

1 x Can of Adhesive Spray

Prepare the enclosure for installation.

The Kicker CVX subwoofer will be loaded inside of the vented box. This subwoofer is designed to be used with either a sealed or a vented box, however a vented (sometimes referred to as ported) enclosure is used for this instructable. Fill the subwoofer box with Poly-Fil. Spread the FiberFill around the inside of the box. Adding Poly-Fil simulates a larger box, which results in deeper bass. The box was filled with Poly-Fil to enhance the sound emitted from the sub box, as well as optimize the subwoofer's performance. Because the box is vented, The Poly-Fil was adhered to the box with a spray adhesive to prevent it from being pushed out the vent during use. A 2 foot section of the 12 gauge speaker wire was soldered to the back side of the box terminals to provide a secure connection.
420guy4 years ago
You should not need any polyfill of any kind if the box is made for the subwoofer. If the box is already the right size and then you put in polyfill you run the risk of blowing the sub as it now sees a much larger box size.
 it could have come already polyfilled to allow for the box to be made smaller.
 it is recommended to have 1lb of polyfill per cubic foot. 
No, it is recommended to build your box the right size to begin with. This way you don't need the polyfill.
You never actually read any thing about building boxes have you?

Polyfill slows down the flow of air through the box, tricking the speaker into thinking it's in a bigger box. This works if the speaker is in a box that's too small (as often happens in car audio). Used in proper amounts, polyfill can make a speaker perform as if it's in a box up to 40% larger. Polyfill also makes bass sound cleaner by reducing standing waves (like echos inside the box) and helps the speaker produce a flatter frequency response.

Any speaker box should always be filled with loose polyfill,
 polyfill an help fix up the displacement that the woofer/sub cause so you get the ACTUAL volume you tuned it to, not minus the woofer/subs volume. it also allows you to make the box a little bit smaller and still have awesome sound and SPL.

and anyway, if you have a good enough woofer/sub it wont be damaged by a bit more excursion than it would get, IF it got more excursion. which it wouldnt because if its tuned lower it will restrict the excursion more at the loooow frequencies. thats why home theater enthusiasts (like me :-)) like to tune boxes to below 20Hz. so that is plays the loooows and and doesnt bottom out while doing so. i dont know about you but i dont really want a 8 cubic foot box (most likely how bid the one for my 18" will be) in the corner of the room adding to the two 1.3 cubic foot 12"s (which are tuned a bit too high for movies, but good for music). it just takes up too much room, id enjoy being able to cut a cube or two off that and still keep the 18Hz tune.
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