I have an old Klipsch SW10 and recently the voice coil is blown in it's 10" driver. This system uses a K-1013-K 10" driver front, 12" passive radiator rear, with a 100W into 8 ohms amplifier. There is a 180 deg. phase switch but there's no boost or subsonic filter that I know of. The enclosure volume is 2.25 cuft before driver and amp displacement. I guestimate a 2 cuft volume. What I'm thinking of doing is replacing the driver and radiator with the CSS SDX10 and APR 12. The original setup only went down to 30Hz. I'm hoping the CSS drivers can take it a bit lower. I figured as long as I was replacing the driver I'd also line the walls with that denim insulation. I would love to be able to model it in WinISD but I'm not sure how to do it and I'm not sure I can with the free version. I'd like to get an idea of what to expect by doing these upgrades.