Bose killers
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Because of the way line arrays work, you can usually put these on stage behind the band facing forward. Use them for stage and FOH. Feedback is controllable as it not a loud point source. Sound is very balance on stage and out in the audience for folk, bluegrass levels.
If you want bass, you can add a sub later.
Unless those things are much shorter than they look, i have to think portability would be an issue. Looks to me like you'd need at LEAST a full size minivan with the seats taken out to move them.
Might not be a consideration, but it could be.