A little late to the party, but...

We have five sets of the older EON 10 loudspeakers and a pair of the EON 15s. We use them in school auditoriums, conference rooms, and even hotel ballrooms (to save money) and we've used the 15s on numerous occasions in large rooms with 180 adults and 50 kids no problem. When the kids perform, we add one pair of 10s in the back of the room.

Usually a single 10 is plenty for a meeting room that holds 40 people, though if they're going to dance, two are better.

BTW, stands are imperative.