For an unexcelled combination of extension and sensitivity you can build a 60 x 30 x 30 inch monster loaded with two LAB 12 woofers. It offers performance good enough for even the top ranks of pro-touring sound, as seen in this SPL chart.

Or you can build a 60 x 30 x 15 inch 'Slim' version loaded with a single LAB 12:

The low profile of the 1x12 allows placement in front of or even beneath stages, and when it's time to pack up optional built-in wheels and handles make the T60 its own hand truck.

And you can build something in between the two extremes, like a 60 x 30 x 27 inch cab loaded with LAB 15 woofer, with the response shown here:

What's most important is that you can build this pro-touring concert sound capable sub woofer for as little as about $400 and get performance that is the equal of commercial subs retailing for up to ten times the price.

Construction Degree of Difficulty: 5

Performance Quotient: 10

Suggested Audience Size, 2x12 loaded:

1 cab up to 200; 2 cabs up to 500; 4 cabs up to 2,000; 8 cabs up to 6,000; 12 cabs up to 10,000

Equivalent Retail Value: $1899 to $3499, depending on cab size and driver complement

Recommended Tops: DR200, DR250, DR280, DR300, OmniTop 12, OmniTop 15

Plans are $14.95, delivered within 24 hours as email attachment in MS Word format. 22 Pages, 41 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!