I need a sub for a medium sized room to complete a Paradigm AMS-250 and CS-160 in-wall 5.1 installation. Physical size is an issue (WAF) since it must fit in an entertainment cabinet. Listening is 75% TV, 15% Home Theater and 10% Music. Music is background listening, not critical. I am considering the Hsu STF-1 and the new Energy S8.3. Both price and size favor the Energy, but not by much. Which would you choose? Thanks.