I am trying to decide on a subwoofer for my house's new home theater. The room size is 12x18x10 (2,160 CF) and the amp is a Yamaha RX-V2700 matched with (7) Proficient C870 speakers in the ceiling. The sub will go into the front r/h corner where I have about 30" x 24" of placement room. Given the configuration, I suspect I need something in the mid-size room level but am unsure which direction the sub "firing" should be and other details. I would prefer a solution in the $500-$700 price range, but willing to listen to ideas. Currently researching HSU and SVSound models. Thanks in advance for your thoughts.