I was very active in the '80s. That would have been a dream/drool studio to me when it was created.
All of my JBL equipment had a great deal of value in the late '90s when I "retired," so I ended up selling them off never realizing that they were already true treasures, but I still have a few pair of those Yamaha NS-5, NS-10 monitors. I have those same in 8" 10" and 15" that I do not know what to do with.
One pair of NS-5s lives in the garage.