I need some advice on setting up a 5.1 system in a small-ish 13x12x8 ft^3 living room (opens up into a 9x7x8 dining room, though, making the effective volume ~ 1850 ft^3). While I do watch a lot of movies -- making low end extension somewhat of an issue -- I've been spending a lot of time (60%?) listening to music, making the quality of the bass more important than output. In looking for a good musical subwoofer to match with my Ascend Acoustic CBM-170s, I've narrowed my choices to the ACI Force and the Adire Rava based off of rave reviews on numerous forums regarding their musicality. Is the bass extension (low 20Hz for the Force vs ~30Hz for the Rava) and the reportedly slightly greater accuracy of the ACI sub worth double the price of admission? Or are the differences which seem big on paper so negligible in real music and HT use that I should just save my money? For the price of the Force, I could almost pick up a stereo pair of Ravas, but if the Force truly is noticeably superior, than I wouldn't mind plunking down the difference. Thanks for any advice that you may give on this matter!