That is exactly how I use my K4, playing in a live rock band. But it doesn't have the bottom end for an arranger. You would need to add a sub woofer for that, and there is a mono sub woofer line out on the K4. I used to use a powered PA cabinet with a 15 inch speaker that had far too much bass for a band situation and I would have to cut the bass EQ severely. So I like having a stage monitor that is more even in frequency response. But my requirement is certainly not an OMB situation.