lindsayt said:
Have you compared them against any of the following speakers:
Altec Model 15
Bozak Concert Grand
Bozak Symphony
Celestion Ditton 66
EV Sentry III
EV Sentry IV
Ferrograph S1
Goodmans Magisters
JBL L100
Klipsch Cornwall
Klipsch La Scala
Quad ESL57
Quad ESL63
Urei 813
Where can the OP (or anyone else for that matter) compare modern speakers with even a small sample from that list? (Without use of a time machine.)
How many present day households would have the room for such massive speakers as many of those on your list? (Or be able to tolerate their presence on domestic/
aesthetic grounds?) The smallest ones there (I think) weigh 56lbs per cabinet. Some of the (much, much) larger ones would cost many £100s just to crate and freight.
Some of them date from around 1965. Where can economically reasonable servicing and spares for a 46 year-old speaker system be obtained? For example, a clean pair of working
15" Altec woofers currently cost £370 + £114 postage on ebay.
Answering your earlier question, yes I have heard three (Goodmans & both Quads) on your list a long time ago. I have also heard old IMF/TDLs and KEF 104abs and Celestion Dittons (33s and 44s not 66s).
I wouldn't advise such vintage speakers unless someone was passionate about them, had a very large room to put them in, and the knowledge and skill to execute many repairs themselves. (Or become part of a dedicated owners group where help could be located.)
The OP may be interested in something
like this so I won't prejudge his possible interest in your ideas.