For unmatched extension and sensitivity you can build a 36x36x36 inch monster loaded with two fifteens. Or you can build a 36x36x20 inch 'Slim' version, load it with one fifteen or one twelve, and stack as many as you need for your LF extension and SPL output needs. Or you can build something in between the two extremes. You even have options for frequency response and average sensitivity. Build the vertical baffle version for extension to 15 Hz, or the horizontal baffle version for less extension but higher output. Here's a 1m/1w SPL chart for the 30 inch wide horizontal baffle version, loaded with one Eminence Magnum 15LF, compared to one of the premier commercial subs, the dual 18 loaded $1300 JBL SRX728S.

Here's a review from builder Christian Senf:

If you're reading reviews of the T36 you are clearly interested in maximum bass. You have found your subwoofer. These things crush any commonly available commercial cabinet. I have compared a couple, both powered and unpowered, and nothing is even remotely close. The design is suprisingly forgiving. Enjoy the process. Bottomline: If you have the power, space, and desire for absurd bass, you own it to yourself to build this thing.

What's most important is that you can build this pro-touring concert sound capable sub woofer for as little as about $300 when loaded with a single Eminence Delta 15LF driver, and get performance that is the equal of many commercial subs retailing for ten times the price.

Construction Degree of Difficulty: 5

Performance Quotient: 10

Suggested Audience Size:

2 cabs to 300; 4 cabs 250-800; 6 cabs 700-1,600; 8 cabs 1,200-3,000; 12 cabs 2,500-5,000; 16 cabs over 4,000

Equivalent Retail Value: $1999 to $3499, depending on cab width and driver complement

Recommended Tops: DR250, DR280, DR290, DR300, OmniTop 12, OmniTop 15

Plans are $14.95, delivered within 24 hours as email attachment in MS Word format. 16 Pages, 20 Photos, 6 diagrams. PDF available on request. Also includes an active 3D program so that you can view the cabinet in any orientation with X-Ray vision!