There is a whole subculture of modding the classic Klipsch products ... Cornwall (probably the easiest to tame), La Scala, Belle Klipsch, and of course the Klipschorn. Look up "Klipsch Forums" and off you go. Classic Klipsch are famed for dynamics but the frequency response can be sort of uneven in the 1950’s manner.
Aside from response irregularities, the quality of the factory crossover parts is kind of marginal. But there are at least two different vendors selling premade souped-up crossovers for each of the classic Klipsch models ... no soldering needed.
The KHorn definitely requires corner placement in order for much bass below 60 Hz ... the corner of the room completes the horn mouth, expanding it several times. Some folks actually use false corners, which work fine, provided the false wall is reasonably rigid and doesn’t vibrate.