Recently listened to a PW-2200. Sounded like it had some low end strength (we listened to sub only for DVD soundtracks and rock and roll CDs and ran the cutoff from 60 to 150 Hz). So, if I spend the money on a DIY what more do I get? I'm looking at a 'vented' (EBS?) Shiva (partially 'cause they take the guesswork and simulation away). Do I get more SPL (using a 250 Watt (or so) plate amp)? Do I get better articulation of bass notes on music? I'm looking for more function that form (flat blacked plywood would be elegant enough). Know how to use a table saw and still keep my fingers attached to my hand.