Fun conversation. My background is pro sound and I do not fit the audiophile label but have always enjoyed horn loaded speakers from Klipsch, Altec, Electro-Voice, and JBL. All of these companies shared engineers and technology back in the 40s and 50s developing the state of the art at that time.
I owned a pair of Altec A7 Voice Of The Theater cabs with 511 horns and onboard Altec biamplification back in the 70s. They sounded fantastic in very large rooms or even outdoors but completely overwhelmed small rooms and the deep 35hz LF never had a chance to develop.
If you get Klipsch, choose the large cabs and put them in the corners of a large room for best results. Some wall diffusion to eliminate standing waves may also be a good treatment for best sound.
My brother owned a pair of Heresys but put them in a highly reflective room in a poor location. I thought they sounded harsh and never really pleasing to the ears. With good placement and a well-dampened room they would probably be a lot better.
Other vintage speakers I like from the 70s-80s:
JBL 4311 Studio Monitors- Worked with these a lot and they are very true to the recording.
Advent- Typically a bookshelf infinite baffle design with quality components and very nice sound.
Boston Acoustics A100- A tall speaker with fairly cheap cabinet but great sounding speakers. I still have a pair of these.
Cheers!
https://audioxpress.com/article/altec-lansing-s-voice-of-the-theatre-speakers-what-you-need-to-know