I sometimes play through a pair of UL112s, stacked on top of each other. I've seen plenty of threads talking about the benefits of stacking identical cabs vertically - the cabs couple for better low end, and the stack avoids phase issues and comb filtering. BUT, I play in a trio with a drummer and guitarist, and we play fairly complex and sometimes unstructured music, so it's imperative that we are able to hear each other on stage. My band mates have asked me to turn the top UL112 about 30 degrees toward them so they can hear me better (that is leave the top cabinet on top but just rotate it a bit). Does this roatation of the top speaker then cancel out the benefits of speaker coupling and the avoidance of comb filtering? It sounds OK on stage for me but I don't know what the audience is hearing. Thanks!