I play in an acoustic roots trio with acoustic guitar, mandolin and fiddle. For us a single Bose L-1 classic and bass unit works great. We all play through mics into a small mixer then into the Bose which serves as monitor and PA. This seems to work well for the similar size venues we've been playing. But, we don't have a drummer...
If you need more volume or dispersion I'd second the recommendation to get a second Bose w/ bass unit and put one behind you on the left and right to serve as monitor and PA. I'd be inclined to run all of the instruments through a small mixer then run the same mixer output to the two Bose systems. That way everyone will be hearing what the audience is hearing. To me that's a big benefit.
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Steve
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