F3 = 42 Hz from a $6,500 pair of floor standers? The JBL LSR305 ($300/pair 2-way active monitor) does that, so not impressed.
The passive radiator used to filter port noise/etc.? Sorry but again not impressed, frankly haven't been all that impressed with the B6 or UB5 that a friend has/had either.
OTOH haven't heard them for myself.