I'm thinking about this... I have a 12" driver (C-V HED-12) with a high Vas (192 L), and 22Hz Fs. WinISD shows me I have a -12 dB response at 20 Hz using a 60 liter box. This driver really wants something bigger... How about a Linkwitz transform? WinISD shows you the correct excursion data when using the transform (I'm aiming for -3dB at 20Hz), but it doesn't show power requirements. Also, I'd believe the driver really needs to be very beefy in order to withstand the beating. I have been using this driver for a while in an 84L box, with 180W RMS. So far, no problems. It has a (supposedly) 34 mm Xmax so I guess this would help a bit... Does anyone have any extra info on Linkwitz Transformed setups? Thanks a lot!