I don't have 1+1's. I have Model 2's. I am looking for a pair of 2+2's to replace the Model 2's. With the 2+2's up front I won't need any kind of crossover or subwoofer. With 4 electrostatic panels instead of 2 the limited volume and low bass problem disappear. Seamless sound from 32Hz to 20KHz. I will need to replace my (what once were) Dyna MKIII's. I could always use the input driver stage I designed with a new output stage using 4 6550's or 4 KT88's per amp. This should give me around 120Watts or so of tube power. Maybe then I'll replace the Model 1's in the rear with 1+1's. That way I could use my (what used to be) Dyna MKIII's for the rear channels.
I used to have a pair of Model 3's. They were flat to 32Hz with no subwoofer. The larger radiating area coupled better with the room and consequently they did not need enormous amounts of power. They were just too wide for my current room.