prof,
I'm using the Thiel PX05 passive crossover to drive the SS2.2.
As I understand it, the PX05 takes the full range signal going the 2.7s and passes the low frequency signal to the 2.2 sub. There is no high frequency roll-off for the 2.7s.
The PX05 was configured specifically for the 2.7s. Input to the crossover is via four interconnects from the amplifier's output terminals.. I'd guess the low-pass point is circa 60-80 cps. The PX05 signal goes to the Sub via an XLR cable.. No LFE input from the preamp.
george