The stock crossovers will need some work, they use sandcast resistors (ew), film caps, iron core inductors. Will most definitely be swapping out the resistors, likely the inductors, and MAYBE the caps if I can find equivalent values at better quality (the crossovers use some very oddball cap values). All of the Klipsch drivers are proprietary, can't say how they compare to other designers specifically, but I will say the most recent iteration of their Heritage line (version IV) has been very well received. I've seen members on Audiokarma say they would take the new Heritage line over vintage Altecs like the model 19 and many old JBLs. Pretty hard to find a bad review of these speakers, specifically the Forte IV and Cornwall IV, most everyone seems to say they are a knockout. The horn speaker / high-sensitivity speaker market is pretty small, I've signed onto living in that niche given I am running single-ended class A tube amps. My 801A amp is a beastly 7-watter
the 99dB in room sensitivity of the Forte IV is a good match, loved what I heard from them when demo'd. Other players in the high-sensitivity market that aren't ultra expensive are Volti Audio, Zu Audio, Omega, Fern & Roby...open baffle is another option but again, not great having exposed wires / drivers with cats. Klipsch is a nice choice since they are a mainstream brand that isn't bonkers expensive, I don't have to cry if something breaks, I can just get it replaced without too much stress.