OT, but I'll list a few: X5 sounds very dark, almost muddy in comparison to the R6. R6 soundstage is tremendous. X5 soundstage is average. X5 highs are much more rolled off than the R6. R6 MSEB is better implemented than V4A. V4A's bass adjustment works great. Didn't see much improvement in the other options. R6 leans more to reference sounding with a slant to warm. X5 is warm.