What features are most important in a home theater subwoofer?
For me, firsty, the sub has to sound well and be able to fill the room with clean crisp base. My first sub was an 8" Paradigm which I thought would fill a 12 x 14 room fine but, I found it to not have enough power, I promptly returned it and got a 10" model.
Secondly, good quality components and connectors. I want something I buy to last.
Thirdly, simple and logically layed out controls.
Finally, auto line sensing power on/off. Because I am lazy.