My brother is basically Head of Deptarment in Media for a Major University in Brisbane Australia (Brisbane being a Major City) and has installed one in their lecture theater.

I say this because they do nothing BUT lectures/spoken word events, and so as far as I'm concerned, the L1 should cover any Dialog beautifully.

See if she can afford the Model 2 which has better coverage (wider dispersal of sound) than the Model 1 - either way, I doubt she'll be disappointed.