I've used an L1 Model 1 with 2 B1's for large outdoor festivals for well over 500 people on several occasions. I had a compact behind me, on stage as a monitor and the L1 B1's in front of the stage. It adequately filled a football sized field with clear sound ... I got advice from folks on the Bose forum about placement etc. to get max sound clarity.
Ciao,
Jerry