They had a kind of sound of their own, like the tannoys I like to be fair. Translation to other systems is more vital now as we have an audience who listen on so many products like phones, home cinema, Hifis of v 4315 arying quality and us lot in our own studios. Something that sounds excellent on one and horrible on another is tagged bad while something that sounds just ok on all of them is somehow good. When I was first at work I spent a year selling hifi in the 70s. Practically all the Japanese speakers at all prices were lightweight. The big JBLs very different. Plenty of bass and hihats that took your head off. Compared to the Sony, Technics, Panasonic and Yamahas we’d easily sell JBL to well heeled customers because the start of Money for Nothing knocked their wigs off. The Celestions, Tannoys, and specialist British makes were much more refined, but didn’t do well on the Dire Straits test. Cinemas here often had very big JBLs behind the screen. Massive three way beasts with the slatted diffusers on the horns.
I’ve often wondered if the old studios got their clients by the sound of their speakers.