I had pretty much the same experiences as Frank and Gary ... a couple of large outdoor events with a horn man, singer, 3 keyboards. I was concerned that I wouldn't fill the large areas and I used 2 b1 bins. As I was concerned, I turned the volume up to over half and it was very shortly requested that I turn the volume down. As for a large indoor venue experience, I annually work a LULU temple hall that seats 1,000 and the PAS with 1 b1 adequately fills the hall. I would advice that if you intend to feed a half dozen mics via a mixer, be sure that it is a very good one, many of the smaller mixers and brands of lesser quality will produce a lot of unwanted noise, especially with wireless condenser mics.
Ciao,
Jerry