Hey guys- long time stalker, finally pulled the trigger and got my AX8 yesterday! I know a lot of people are huge on Matrix, Crown, Crest, ext as power amps, but I may be able to get a sweet deal on a MB500. Has anyone had any experience using just the FX return as a power amp on these. I know it can be done, but my concern is if it adds any color, or if it's just straight/clean power? Thanks everyone for your help!