Was the 6XX $300? Does anyone know the margins on these things? Or actually, the manufacturing costs for Sennheiser on each of these units?
Oops, I meant $300 apart, and that only makes my point even better.
Since what I was saying is that it’s entirely possible that there isn’t a “substantial” difference between between the 58X and 660S, given the very wide gap between the 6XX and 660S.