These subs look great for HT. The 15" would take a box similar to a Tempest, but a 2.5 cu. ft box tuned to 20 hz looks amazing for the 12". The 12" is flat out to about 21 hz, and the 15" is flat to about 18-19hz. One drawback is they need a decent amount of power. http://www.betteraudio.com/products/12d2.htm http://www.betteraudio.com/products/15d2.htm I know the people personally that started this company, so feel free to ask me questions.