Ed -
Atlas, for sure, 8" speakers are readily available. if you have a problem locating them let me know and I'll see what I can do.
Also what I did on my last big PA job (JFK -AA. 5,000+ speakers) was, when we had a large grouping of speakers instead of looping them all (as the plans called for) or setting up individual runs, I had the guys run one feed to a central location, mount a 3 or 4 gang electrical box and then bring individual runs out to logical clusters. As long as the splice point is marked on the prints, troubleshooting is very easy.
And with that many speakers, you'll want the two most important pieces of test gear available - an impedance meter and an iPod. With those two you can get anything working.
Sam
