Thanks everyone for their input,
I’ve cooled off on the idea, I may go listen to them just for the experience.
both the 18" woofers and the 5 balance control settings via resistors intrigued me.
My pair of 15W’s are more than enough bass, I have ports for ’more’ but keep them closed. and I will replace my original 16 ohm L-Pads for ’Brilliance’ and ’Presence’ control. I removed them, the speakers need them, I believe the speakers were originally designed with the L-Pad in the middle of the range as standard, then more or less from there. The AT37's were 12db range.
15W is 37 lbs, 5 pounds of alnico magnet. It not only makes bass, it powerfully controls it.
https://products.electrovoice.com/binary/15W,%2015BW,%2015WK,%2015BWK%20EDS.pdfIt’s hard to read, but interesting:
last paragraph, The "Building-Block Method". Their enclosures were designed to allow adding other drivers later if desired/
more about that
https://products.electrovoice.com/binary/BB1,2,3,4,5%20EDS.pdfthe ’add on’ kits, (which horn, which crossover) were based on your existing low frequency magnet size/weight
a. kit for existing 1 lb magnet
b. kit for existing 3 lb or greater magnet.
It’s easy to understand how the AT37 L-Pads were needed for existing and future ’building-block flexibility.
Way back to Mono, then addition to a second system for stereo and ’upgrade’ your existing system. Fun to re-discover that era.