I am putting together a stereo sound system for my PC. I want accurate sound and I have settled on the NHT super zero as the speaker of choice. compact, sweet sounding, and it works wonders as a near field monitor. the question is what to do about the bass. the NHT has 4" woofer and doesn't go very deep. I need some sort of woofage that will fill in the bottom end cleanly. I don't need 25Hz extension, and I don't need very high SPL. just something that will fill in the bottom end to make for a nice full sound. THe idea is to keep it really inexpensive, but good sounding. What are my options? Obviously it will not be a subwoofer bought at regular price at a regular store. I am thinking perhaps you know of some subwoofer on close out somewhere, or B stock or something, something you wouldn't consider for a stand alone HT sub, but that strikes you as a nice woofer for a small scale set up. Or something along those lines. can you guys think of something? I wonder if I could find a passive sub, or maybe just use a good 8" or 10" car sub in a premade enclosure. YOu see I have a 90 x 4 (at 4 ohms) car amp thats a pretty good device, and I am going to supply it DC to drive the super zeros with it. I can either bridge it to mono if I have a powered sub, or I can set it up tri way with an unpowered sub. what do you guys think?