Ok, After doing a few more hours of research tonight, I learned a few things: Couches can act like bass traps & its ok to fire the driver up. In light of the furniture issue, I do like the two front firing drivers with the one being higher than my couch. I like the idea of having a driver that is unobstructed from my listening position. What do you think of going for the same dimensions as the thiel ss4? 19"W x 28"D x 51" H With 2 RL-p15's, and the Adire 1200@4ohm with LT plate amp? http://www.adireaudio.com/Home/ADASubAmps.htm I am willing to adjust the cabinet size to match the drivers, but this is where I am stuck. The soundsplinter site says "2.5 cu ft, with the general consensus being that 2.1 cu ft net volume is ideal for a flat frequency response with good low-end extension and output." So for two drivers would I double the cabinet size to 4.1-5? That does seem a little small to me. If I am doing the math right the thiel cabinet is about 15.7cf http://thielaudio.com/THIEL_Site05/Pages/m...ubs/subwo1.html