In my home studio, I have two JBL EON G2's (on stands) and a JBL 18" sub. That's plenty of power, depth, and punch.
This weekend, we just played the first 3 shows of "Peter Pan" in an auditorium and I only brought one JBL EON G2. It had plenty of low end and sounded excellent. I think you could easily get away with just one EON G2 for most situations.