I believe you said you were looking for a sub that would shake the walls or something to that effect. The PB12 was described by an Audiohaulics review (still available on line) as an "earthquake in a box" and for a time was in the Audioholics recommendations for a $25,000 system. It is also the subject of many threads and several other published reviews. It is a well known and recommended commodity. However technology improves over time and other subwoofers may have eclipsed the PB12+2, particularly if you look at Craigsublist rankings. At $1200 I think it still may be the best bang for the buck. If you figure out the speaker diameter piston areas (pi r squared) the two 12" speakers come out with a piston area greater than a 15" speaker yet a little less than an 18" speaker. When I last looked an 18" subwoofer (such as Velodyne) is a lot more than $1200. I think the PB12+2 moves a lot of air and can pressurize a very large room. If there is a better bang for the buck out there I have to defer to the other forum members for a recommendation.