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I've had an old Kicker C-18a taking up space here for a while now, and wanted to put it in a box. I didn't want just a typical sealed enclosure, nor did I want the 'normal' ported box. I wanted something that would sound good, have great n low-end response, would protect the driver from outside harm, and use material I already had. So, after a few days (weeks) of research into the different box designs, I opted on a 4th Order enclosure, as this driver is better suited for a sealed box, and I didn't want an exposed driver. The designed response plot is here.  After playing with the response in WinISD, I finally decided on something with decent response, workable dimensions, and fairly easy to build. The wood I had avalible was 4 2'x4' pieces of White Oak 7-ply board. They went together fairly well, and I wasn't very worried about looks as this was really just a test design to see how well it would work. It was my first time building this type of enclosure, but I had it built in a day or so. The driver is held in by 5/16" bolts, blue Loc-Tite, and teenuts. 
 The end product was quite impressive, and I honestly wasn't expecting the response I got from this cabnet. I'm not able to fully test in the shop as I'm not set up for SPL and frequency response, but from what I hear, it is doing damn close to what WinISD plotted. I am using a DECA 700 to drive it, crossed over at 120Hz. I have driven it to clipping (370w) and have very little cone movement at 25-40Hz. The CS400 on the right is for my mids/highs. Both amps have their own project pages which are elsewhere on my site. The ports are 6" diameter and it is very directional, even for subwoofer frequencies.  |
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