There are many videos on vintage speakers and drivers on the forum, from WE, Bionor, Altec, JBL, TAD.
I would suggest keeping discussion details of drivers, e.g. Altec 288g vs H vs K vs the 290 or 291 series, or JBL 2441, 2440, 375, 2482, 2450 etc, separate. If one likes Altec or JBL or such, they can always get into the details of these. There is a whole forum dedicated to the Lansing Heritage (Altec, JBL, and TAD) called audioheritage.
Imo people should just audition horns and note down what they like. These are all very different. Many horns sound good or bad due to the design first, the driver comes next, i.e. you can put an excellent midrange driver with digitally active bass that does not align to the top and it can sound poor.
But again, let's not turn this into a DIY thread as there are already many on the subject. It should predominantly stay a Tang system focused thread with periodic offshoots and in humor, anything goes.