Quote:
Originally Posted by estreeter 
I dont know about the K400, but its a lot tougher than the K501. I hope you have a big, nasty SS amp waiting to tame the 601 : if not, I'd look elsewhere. Still not sure why AKG felt the need to make the second-in-line to the current throne even harder to drive than big daddy 701 ...
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Well, I run my K601's perfectly well with a CTH, and it's cute and tiny.

I think that the fact that the 601 is harder to drive is just a side effect of using a lower cost standard wound voice coil on it vs the flat-wound vc on the 701. Since the magnetic field is more concentrated in a flat wound coil, I suspect that it would also be more efficient. In this case it looks like they possibly designed the 701 first, and then looked for ways to make a "cost reduced" model in the 601.