The Hsu vtf15 is a great theater sub, his hard rumbles and is great for movies. Music didn't use much but. Seemed to stick out in the music. Now I have rythmik 12inch fs12, using with 1.6 Maggie's and it integrates very nicely. Quick bass clear precise but has no boom boom which is perfect for me just mixes in great. Also wife just dances and never complains with rythmik, but hsu all time turn it down.
Now for theater have no idea what the rythmik will do but it's nothing like svs or hsu. It is just great bass.