Brendo - As the concert was from the 70's, the speaker technology from then was quite different, especially in terms of a sound power experience ala Floyd E. Toole / Axiom (and a host of Harman International speakers - Toole's labs are there).

There were some bi-polar speakers and also other designs intended to create what is now showable in a family of curves. The Bose 901 is the most famous, and there were some other high end companies at the time doing it. There were no measurements behind the concept - merely drivers pointing in different directions.

What's remarkable is this: I have heard Live Bullet a bazillion times. I think we wore out 3 LPs my freshman year in college. The audience noises were always noticeable, but the Active 1100's make it clear how the audience was recorded.

Now I am looking forward to playing The Wall in its entirety - but this HAS to have an EP800 in the mix. laugh