I have a GK MB150S that I have had for a little over a year and want to use it for an outdoor gig (freebie) in October. I have ever played thru it outside, and my wife (musician) doesn't think this amp will do the job. We will be playing on a stage which in an old truck trailer with the front cut out, mostly old country with a few newer tunes thrown in. I'm using MIM Fender P bass which does a good job. Probably won't be more than 100 people there at any one time, and we're playing right in front of them. She thinks maybe I should spring for the extension cabinet (MBX112?) that goes with it, but I'd probably never use it again, no more than I play. No thrashing and banging around on stage like some of these big hats do..just simple country music played at a pleasing audible level. What do you'all think? Thanks for the feedback.