Originally Posted by 04FLHRCI
Thanks for your continued contributions to our community.
In the opening statement you indicate this unit is one in what is to become your cinema series of designs. Do you have any ~20Hz TH designs under consideration?
I'm tempted to try this guy, but I'd really like to experience a 15" TH in a similar footprint.
As it looks currently, I'll have 4 designs in my Cinema series, each with a variation or two. I have models and ideas for folds for a large tapped horn with a single 15" driver, and an F3 below 20 Hz, but I don't have a dimensioned fold yet, nor do I have a driver to work with.
Here's the remainder of the Cinema Series (as I see things now):
Cinema F-20 (this thread) with a stretched variant that's in the works. The stretched one (F-24) will play a little lower, but might need a more capable driver.
Cinema T-6 (coming very soon - fold is done, plans are done, multiple suitable drivers in hand, my initial beta was a fail, but the current refold's beta results are great) Tapped horn with an 8" or 10" driver, cabinet is 6 cubic feet, F3 of ~28 Hz, single 4X8 sheet of 1/2" plywood. Widths will vary based on the driver used, 11.75" internally is about the limit for an unbraced cabinet, no point in going wider, the aspect ratio of the throat (width/depth) gets too large IMO.
Cinema T-12 (coming soon, model is done, fold is sketched, scaled plans are started, drivers are in hand and need a proper home) Tapped horn, 12 cubic feet, F3 of 20 Hz, 10" or 12" drivers, two sheets of ply. Widths will also be varied on this one, and it might get a stretch, all of this depends on the results of the beta build.
Cinema T-16 (a little further out, model is done, fold is sketched, but I currently have no suitable drivers to test with, though I am working on that too...)
Tapped Horn, 16 cubic feet, F3 ~17 Hz, 15" drivers, less than 3 4X8 sheets of ply. As with the T-12, widths will be varied on this one, and it might also get a stretch, this all depends on the results.
My design goals for these?
Capable of at least 115 dB in a groundplane setting within 1/2 octave of F3.
No more than a 6 dB drop from 2 octaves above F3 to F3.