There is a fair bit of reasoning as to why a vertical 2x12 is better than a 4x12. As a bassist I would prefer to be on stage with a guitarist using a 2x12. Quad boxes beam horribly, 5 meters in front of them they will be the only thing you hear, slightly off to the side and you don't hear the guitar. Single or vertical speakers have much better dispersion in both the crowd and on stage.