I went to good ol' GC the other day and tested out some GK Backline stuff (again), hoping to decide on something in the next month or so. I tried out a Backline 600 hooked up to a 2X10" cab, and I also tested the Backline 210 combo (also a 2X10"). What I heard interested me... the 2X10" cab sounded deeper than the 210 combo. Assuming all things were even approaching equal, why would this be the case? The only explanation I could think of would be that by designing the combo to be a kickback style, the enclosure wasn't tuned as well as the standard, non-kickback BL 210. Anybody with experience (especially designers/manufacturers!) care to chime in on this? Do kickback cabinets/combos sacrifice some low end response for the ability to tilt back 45°? Thanks to all who care to contrbute.