So... my re-immersion into the hifi hobby was actually catalyzed by the acquisition of a pair of 1974 vintage Cornies...
..."Heritage Klipsch" products, but they are deeply flawed products. The deepest 'flaw', to me, is a harshness and aggressiveness that can render some recordings unbearable (again -- to me).
LaScalas, by comparison, are essentially bass free and have been famously likened by Tom Brennan to Sawzalls...
...the best placement options for most of the heritage Klipsch loudspeakers is face down on the floor, if placement in someone else's domicile isn't practical.
a) Can you cite a brand of circa mid-70s loudspeaker that was not flawed, deeply or otherwise? In any case, current Klipsch heritage speakers are not the same as those from 1970, although the basic design has not changed, that much is certain.
b) Who is Tom Brennan and what is his context in relation to loudspeakers? Don't recognize the name. Just curious.
c) I do not find them harsh but YMMV for sure. That said, the problem
as you state it is not the speaker per se, but 'some recordings'. A decent loudspeaker will highlight a bad recording. If you are looking for a loudspeaker that will make bad recordings sound pleasant, then I would suggest something cheap and inexpensive with limited FR and dynamics.
d) A horn loaded loudspeaker will not have the subjective bass (gut punching room vibrating movie soundtrack capability) as a box (sealed, vented, or otherwise), unless the horn is huge. This is not the same as 'bass free'. Most musical content (non-electronic) does not have those sorts of lows, unless your idea of music has a lot of C-0 to C1 content (middle C being C4); such as pipe organ tunes. Or tuba concertos--Vaughn Williams actually wrote one of those for one reason or another. In that case you then must buy a subwoofer, a lot of power, and consider certain and distortion characteristics. However, for this sort of 'full range' capability most 'full range' loudspeakers are supplemented by subwoofers these days. So to fault horns for this lack of FR seems a bit unfriendly.
e) I see from emoticons that your reply is somewhat tongue in cheek, but someone reading quickly could misinterpret your good will and think you are totally serious. Then it is helpful to consider the old saying: when one so seriously overstates their position it is difficult for serious people to take them seriously. On the other hand, if the purpose of 'face down on the floor' is to irritate the family in the condo below you then just about any loudspeaker will do, and in fact I'd suggest a box loudspeaker and not a horn.