I'm looking to build a sub shortly. It will me used mostly for home theater, but some occassional nice music listening. My room is about 16 x 16 with 10' ceilings. My main speakers are Polk Lsi15's driven by an Adcom 545II(modified), and Polk Lsi 7's for surround driven by an Adcom 2535. I will probably use the PE 250w amp. I would like to have a relatively small enclosure, 3-4 cu'(or smaller if possible) max! I am open to driver suggestions. Also open to traditional enclosure vs. sonotube. Thanks in advance for any and all suggestions.