The power amp would need to be "gain matched" to the gain of the S1100, unless you would be using an active adjustable crossover.
I'm way behind the times on active crossovers (used tube based ones in the 80's) but I would expect that a current high quality SS active stereo crossover would start @ about $1K and perhaps 3X that for a tube based one.
Never had much luck/gain (pun intended) with passive bi-amping, which is what I'm guessing that you are considering, and active bi-amping gets expensive and more complex.
You have highly rated/thought of gear (amp/speakers) and a HUGE listening room.
Do you have the speakers on the 4 ohm taps?
Seems like that should be OK, but if if not then perhaps consider a couple of powered subs to gibe the amp a break.
DeKay
I'm way behind the times on active crossovers (used tube based ones in the 80's) but I would expect that a current high quality SS active stereo crossover would start @ about $1K and perhaps 3X that for a tube based one.
Never had much luck/gain (pun intended) with passive bi-amping, which is what I'm guessing that you are considering, and active bi-amping gets expensive and more complex.
You have highly rated/thought of gear (amp/speakers) and a HUGE listening room.
Do you have the speakers on the 4 ohm taps?
Seems like that should be OK, but if if not then perhaps consider a couple of powered subs to gibe the amp a break.
DeKay