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I like that one Thomas. I like the inclusion of the subsonic filter in the design, as well as the woofer to see where you are hitting Xmax and power limits. Would be nice if the speaker information was as robust as UniBox

Dan - I thought in a sealed enclosure: Fs = Free air resonance of the woofer Fb = System tuning frequency

Dan, by Fs and Qts, do you mean Fb and Qtc? Those were what I thought I was supposed to be using. Have you used Linkwitz transforms? Are they as touchy as they seem on paper? I can't imagine the real world being easier then paper

I have a sub that I can only put in a box that is a bit too small. I was going to do a feedback system, but came across the info for a Linkwitz Transform. Seems pretty much dead on with what I want to accomplish. Working with the value a bit, it seems extremely touchy! Just a small shift in...

That didn't look too good, here you go again: 05-RE OHMS 5.98 06-LE MH 1.75 07-QM 14.65 08-QE 0.78 09-QT 0.74 10-XMAX MM 9.1 11-BL TM 11.16 12-EFF % 0.48 13-FS HZ 19.48 14-MMS GMS 131.96 15-CMS mm/N 0.5059 16-RMS NS/M 1.1027 17-VAS LTRS 521 18-SD SCM 856.34 19-EBP 25.1 20-SPL dB 88.8

I got the T-S parameters for your 15" Dunlavy woofer, and if you are thinking about doing an infinite baffle speaker, this is definately the one. Despite its lackluster appearance, that thing is incredible in infinite baffle. I tried many different box configurations, but nothing does these...