Take a look at this SPL chart, which compares the performance of a Tempest Classic 15 driver in a sealed and vented box, and when loaded in a 24 inch wide Tuba HT, all three cabinets with corner placement:

Want more? Got it. If you've got room for it build your THT 36 inches wide, stick it in a corner and this is what you'll get:

Not impressed yet? Add in the cabin gain of an average room (12dB per octave below 30 Hz) and you end up with flat response to 1Hz with 110dB sensitivity. Not even the most expensive theatrical subs made can make that claim. Here's what builder 'Tweedpower'has to say about his THT:

Built a Tuba HT, my third Tuba. This is a different animal. I built a 30" wide version. This was the widest size that would fit through my door. The low end output is unreal. It is the greatest for the LF channel in my HT. I have been experimenting with different crossover points and I think that I like crossing it over lower at 60 or 80 hz. The power in the sub 50 hz region is impressive. It lets you know what the sound engineers had in mind. I get great output down to 15 hz and basically flat to 18 hz when using minimal EQ.

The sensitivity advantage of the Tuba HT means bass more solid than you've ever heard before. The folded horn geometry reduces distortion to levels that no direct radiator sub can even approach. If you crave bass in your home theatre that shames real theatres, look no further. Tuba HT is the one.

Construction Degree of Difficulty: 4

Performance Quotient: 10

Equivalent Retail Value: $ 1999

Plans are $14.95, delivered within 24 hours as email attachment in Word MS format; PDF available on request. 15 pages, 12 photos, 19 diagrams.

Also includes interactive 3D files so you can view the Tuba HT at any angle with XRay vision!