I am going to replace my 15 year old Infinity sub and need some help with a new one. It will be used for movies and tv, no music. My budget is $400 but of course the less I can spend the better.

The room is 8.5 x 16 with an 11 foot high ceiling at peak. It slopes down from the middle to the front and back of the room. There is also an opeing that is 5 x 7.5 that leads to a hallway and the opening to the kitchen (normal door size).

I have an Onkyo 606, 2 Energy c-300, c-c100 center, and 2 c50 surrounds.

Thanks