reversed loading of sub

I just recieved my new subs. I went with 3 Infinity Kappa Perfect 12.1Ds. Since i have gotten them i have been thinking of different ways to build a box to have it be visually attractive. One idea that came to mind is loading one of the subs in with the magnet and motor out of the box and the cone pointed in the box. I have seen this before but i think i have read that you have to wire the sub differently. My question is how do you do this, and has anyone had experience with doing this and how will it effect the performance of the sub. Thanks

Allen

I would run with a set of binding posts and then wire the speaker lead through the box and to the posts. from there just use the jacks that are now on the outside of your box. hope that helps.

jason 

ok i want around a 2 ohm load to put about 1200 watts to the 3 subs so around about 400 to each which is about the rms of the subs. ok so i just put the - to the + for one voice coil and the same for the other? just making sure im getting ya!

thanks

Wire like this diagram shows, series/parallel:

Except, in your case one of the subs is inverted so its polarity has to be reversed in relation to the two other subs.  We'll use the middle sub in the next diagram as the inverted:

As you can see, the coils on each sub are wired as normal in series:  one coil pos to the other coil neg.  It is when the subs are connected in parallel that the inverted sub reverses polarity.  This will net you 2.67 ohm load on the amp, the lowest these three subs will wire to.  As the three subs fire in phase, the two normally-mounted subs will project the cone forward as the third reverse polarity inverted sub will project the cone backward.  All three will be in phase.

Sound quality should be just as good as if all three were normal.  Make sure you take into consideration the difference in air volume in the enclosure, though.  The inverted sub will not be taking up space inside the box, and in fact will add to the space a bit with the air inside the cone area.  The example below illustrates that, with the gray area representing the air inside the box:

Make sure when you invert the sub that you get it centered in the hole so that when the sub fires that the outer rubber surround wont be hitting the box this way you dont wear a hole in your rubber surround..

Easiest way to do this is install the inverted sub first and if you can reach in and feel around the surround to make sure its not touching....Depending on the sub you may need to open the hole up little bit to get clearance....

If you can reach in just place the sub in its hole and then move it around and find where it touches then split the distance on the amount of play and just guess as to where center is in the hole....

Good luck

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