zombie84 said:

So, the mono screenings of ESB and ROTJ were just the same 35mm stereo print with the theatres sound equipment playing it back through a single channel? That seems a bit odd, at least for ESB. Mono was so common back then, you'd think they would want to make sure it had been mixed specially for that format to make sure the levels were better suited to a single channel.

That's how I understand it, I have never heard or read that they did an exclusive Mono mix created for Empire or Jedi. I may be wrong though, you guys makes me doubt it a little but I'm pretty sure the Academy mono track was something uniquely done for SW, otherwise I think you would've heard about it by now. I don't know, perhaps they did it for foreign markets where Dolby hadn't widely been adapted yet. Remember that after Star Wars and before Empire several films helped to make the Dolby sound in cinema huge, Superman, Apocalypse Now and Alien to name a few.