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And once upon a time Klipsch made horns that you were actually supposed to put into the corners of the room to properly load them.
If by "once upon a time" you mean today, then yes, Klipsch made and continues to make the Klipschorn.
Theoretically horns could be the ultimate speaker, especially in providing life-like dynamics, but:1.) To gain efficiency they cut off bass and over pressurize to the point of distortion;2.) To reach deep bass response they get really big;3.) To address the high pressures involved the cabinets must be very heavily reinforced;4.) Bigger horns easily overwhelm normal sized rooms;5.) Typically have colored/forward presentation;6.) Typically the drivers (bass in particular) are not time aligned.Some of the world's best speakers use concrete bass horns, each the size of a garage to reach deep. To me, good sounding mid/treble horns must be made of thick wood. The Klipschorn is a rather extreme example of a classic horn loaded speaker. Highly efficient, but only rated down to 35 Hz (and Klipsch has a reputation of overrating their specifications). The cabinet is big and complex yet not rigid enough to avoid cabinet colorations (even adjoining walls aren't rigid enough). The midrange/tweeter horns are not reinforced as needed to avoid further colorations. They require two uninterrupted/adjacent corners (which after the introduction of stereo almost killed them off). The bass isn't close to being time aligned yet the mid/treble sound is very forward. All together they need a huge room to sound their best (as per the above show images). Like horn speakers in general they are living dinosaurs, being in production for over 60 years. Being so efficient they normally don't work well with solid state amps which suffer maximum distortion at very low power levels. When introduced in 1946 they were replacing Victrola's, so a huge leap forward, and only tiny tube amps were available.
