Dan's making the driver from the Sadhara available separately, ETA sometime in May. No idea on price, but he sent me a few specs: Fs: 26 Hz Qms: 5.1 Qes: 0.55 Qts: 0.5 Vas: 45L Xmax: 27mm one way Sd: 436 cm^2 Re: 2.6 Ohms Looks pretty cool. No Le spec, but I'm guessing it's relatively low (~4mH) due to the XBL2 motor. 3ft^3/20Hz is an alignment Dan recommends, although I've never used a Qts that high in a reflex. Some pics and discussion can be found in this HTT thread .