Thanks for the link. I watched that video several years ago before I bought my first L1. As a result of that video and many reviews, I bought the fuil package of L1, B2 and Tonematch mixer. I later sold the Tonematch as I quickly outgrew 4 channels when mixing bands.
As the video explains, the L1 system was designed for individual musicians, one per musician if in a group. If a small band is doing its own mix from stage, it can work pretty well. But if I'm out front as the sound guy, there is no way for me to mix the band if everyone is running through a separate Tonematch mixer.
I solved the problem by using a small, 16-channel digital mixer. Now I can run everything through the Bose and (generally) get a pretty good overall mix. I still have to ask musicians to play a little quieter now and then, but they usually agree. But even though my mixer is stereo, a single L1 is a mono device. This is another reason the video promotes the use of mulitple L1s: the audience has an aural sense of where the musicians are on the stage.
Especially in a small room, stereo can dramatically widen the listening experience. I usually don't pan hard left and right, but I do pan the musicians a little based on where they stand. Special effects work much better in stereo; in fact, that simulated "room bounce" of reverb and delay suggests the sound would be coming from more than one direction. My mixer provides basic effects onboard, so I rarely use external processing. Many keyboard patches are stereo as well, including piano, and they sound way better in stereo.
My sound sources are what you would expect and vary per band: vocals, guitar, bass, percussion, horns... whatever shows up. (Nothing more challenging than a trumpet in a small room!)
But back to my original question, running a mono signal through two separated speakers can create phase issues, especially with bass. I'm liking the idea of placing the B2 modules together - or my original thought - just using one B2 and unplugging the other. My challenge is coming up with a way to try it before buying.