Well, I have been talking about starting a proper thread to discuss this design for about a year now....
Anyhow - here it is.
Way back in the dark ages, radman12 tracked me down with his mad internet stalking skills and started filling my inbox with emails about how he wanted crazy bass for the home theater he was building. This was the beginning of what has become the LilWrecker.
The LilWrecker is a derivative of dB's housewrecker project. I tried to get as much of the performance as I could while making it fit into the space that was available. With a few builds, we had determined that the Kicker CVX is not a bad driver for use in a tapped horn. There are other driver options out there though. That will be discussed in a later post.
I started with the space that radman12 had behind his false wall, then factored in the realistic power he would be using, as well as response goals. After eleventy bazillion fold attempts, I finally came up with something that looked like it would work, except, I couldn't model it in HornResp any more, so I brushed up on my akabak skills and verified it would work OK.
We wound up with a tapped horn, designed to use the CVX, tuned to ~17 Hz. It barely fit the space radman12 had to park it, and was big enough that even with two guys, it still took wheels to move it safely (cause I'm old...). Radman12 took the plunge and built a pair, I measured both and helped with setup and EQ right after the paint dried (because I happened to be in his neck of the woods on business).
Once everything was working properly, a pair in his theater is certainly an experience.
I'm sure that as radman12 is able, he'll post up some more pictures and add some comments. For now - I will attach the zip of the sketchup files, a screenie of the sweeps (yeah, on that last one, we were driving the coil out of the gap down low, but it did not clank), and open this up to further discussion.
1W, 10W, 100W, 400W, and amp limits (iNuke 3000, bridged into 8 ohms), measured at 1M groundplane.
<a class="attachment loginreq" href="/attachments/66261" title="">LilWrecker.zip 90k .zip file
Dimensions are 70" long, 28 1/2" deep, and 25 3/8" high, so each cabinet is 29.3 cubic feet external. This is not exactly a small cabinet. Each cabinet takes 4 4X8 sheets of ply, radman12 used Arauco. Bracing is not drawn in the plans, but is required. A single, windowed brace in the center of the panels is sufficient. The build was done with PL premium and 1 5/8" drywall screws.
Hornresp inputs are attached. This is an approximation, as the actual fold uses one more taper than Hornresp can model. It should be close enough. My apologies for not including it earlier. <a class="attachment HM-tool loginreq" href="/attachments/66384" title="Approximation of lilmike's LilWrecker V8.5 (as folded/measured) in Hornresp, loaded with a 2010 Kicker CVX 15 (dual 4 ohm coil).">lwv8_5.txt 0k .txt file
How about some instructions?? Draft instructions attached, please let me know if I screwed something up or if I could clarify anything. The instructions provide a bit more detail as to the suggested bracing. I also bolded a few more drivers that are known to work.
<a class="attachment HM-tool loginreq" href="/attachments/72054" title="9-14-2013 draft of LilWrecker 8.5 Assembly instructions">LilWrecker Instructions.pdf 205k .pdf file
Drivers that should work based on specs I have (in no particular order)
(bold type means tested and proven)
Kicker 2010 CVX 154
Kicker 2010 CVX 152
Stereo Integrity HT15D2
Stereo Integrity HT15D4
TC Sounds LMS-R 15
TC Sounds LMS5400 15
AE AV15H D4
Sundown Zv3 15
Fi Q 15