All Pre 1970 Vintage speakers suck! Prove me wrong

The Spendor BC1 - ok introduced in 1971 - is still a fine speaker.

On the specifics of the topic, it is of course a ridiculous generation to say that all pre 1970 speakers are rubbish. In the case of the ESL 57, very many would argue that the ESL 63 and its successors do not improve on the original design.

What made me an audiophile was a pair of my first speakers which were the old Kenwood speakers when they were made in Japan and not china like today. They aren't audiophile speakers but they were really really good and I thought all speakers sounded like that but I was wrong. When I got rid of them due to age, I couldn't find any that sounded even close to those. Later on I started listening to recommendations from others because all speakers I ran across were just bad. Finally audiophile speakers suited me just fine but I still remember those speakers today. Oh, they were pre 1970. You might be better off wondering what happened to music once 1980 rolled around with a few exceptions of course.

I think the original Large Advent came out in 1971 & was & still is a good speaker. Stack them, remove the grill cloths , provide plenty of good power & you have a fairly ugly but nice sounding speaker w/ as good bass as probably any speaker made since up to at least $5K & maybe $10K. Mid range also pretty  good but not much high frequency extension & mediocre imaging.

My affair with audio began in 1968.  The early ear opening experiences with amazing speakers were with Rectilinear 3s, IMF TLS-80s, and Quad ESLs. Of the pre-1970 Boston area bunch, KLH 6s were best to my ears, but I never heard 9s.  It is true a lot improved as the 70s progressed.

I have an International Projector Corp. 1940's horn and folded cab I rescued from an abandoned adult theater. Yes it's mono, yes its massive, and yes it now resides in my garage. But man does it rock. 

I'd argue that i get just as much enjoyment out my free(ish) find, than I do all my other kit.