I recently had the opportunity to work on a home theater system with a pair of Tekton 18″ Cinema subwoofers. The room was 4500 ft3 and easily achieved reference sound pressure levels without significant distortion. These are the highest output subwoofers I have encountered at the $1,000 price point. They are large with the cabinet measuring 33″ tall x 20″ wide x 26″ deep. The controls on the back were very basic including volume and crossover knobs along with a 0-180 phase switch. There is also a main power switch near the power cord connection, LED power light and it can be set to turn on automatically with a signal or stay on continuously.
This is a simple subwoofer with a very high sound output capability. With the rated 100db efficiency at 1 meter and the 300 watt amplifier it should be capable of 129 db at 1 meter when placed in a corner. This can definitely get you near the 115db required for reference LFE sound levels. If you want a great subwoofer and can accommodate the space for these it would be hard to find anything better at $1,000 each.