I have to know, how does the quantity and depth of bass with the CKN70 compare to the MH1C? I assume the quality is in another league and that the rest of the frequency spectrum outclasses the MH1C as well. Also, how does it compare to the XB90EX? I'm looking to upgrade my MH1C for more active use (it's a bit impractical sometimes), and I think I'm leaning toward either the CKN70 or XB90EX.
What I love about the MH1C is the big, extended bass with no mid-bass hump and the smooth frequency response without any real noticeable spikes or notches. Whichever delivers that the best (and hopefully improves other aspects) will be my next investment, but since I probably can't return an item to Japan, I want to do it right the first time.