I need some opinions on what would be a good choice for a small powered sub 14" square or less to be used only for music in a room approx. 14' x18'. Also less than $400 US. I am using a H-K avr125 and PSB Image 2B bookshelf speakers. On ebay right now is Paradigm PDR-10; Klipsch Ksw-10; Earthquake sub-80. As auditioning is out of the question,( I live in a remote area ) I need opinions and suggestions on these and others.Also when hooking up cables to the sub should I use the Low Level or High Level inputs? Thank You.