Displacement per dollar there is nothing better than our new Home Theater series of subwoofers. With 20mm of Xmax, 3.5" of peak-to-peak excursion, competitive sealed and ported enclosure sizes, and a host of other goodies, the SI HT line has a big subwoofer attitude for an affordable price. The HT series is equipped with highlights that are not found in any other woofer in its price class. Such items include a spiral-cut CZA voice coil former material, two aluminum shorting rings, and a nomex spider. Click on the HT Subwoofers link above to see more about information on the HT series.