I didn't like the Bose in mono, Mikey...the Yamaha S900 that I use sounded thin and pinched through one system, especially the stereo pianos and stereo effects on the guitars, both in the accompaniment and RH.

The coverage with one system was excellent, however, and perhaps a different type of arranger, such as the PA-800, will work just fine in mono.

The Bose is not for every type of gig...it is only for when you want room filling sound...I bought mine for doing concerts, where each person in the audience should hear at the same level.

I have the conventional system for when I want the sound to project a certain distance and drop off, such as I need for restaurant work...where people can sit at a distance in relation to how much they want to listen to the music.

Good luck.

Ian