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Okay, wow! So there's tons of headroom for peaks with that chip, since it's capable of 310 mA peak output - the current supply of the battery/power supply is the limit then (you can only feed it an average of about a third of that [111.8 mA at 16 ohms at 200 mW (an average of 1.7885 V)], if my quick estimate is correct).
I'm not that familiar with power supplies and voltage converters - is the the E11 capable of providing the maximum current all the way to the maximum +/- 6 V voltage swing? If so it would seem it can put a whole lot of power into medium impedance headphones; perhaps enough for portable use of the more power-hungry orthodynamics. (Hey, I can hope, right?!?)
As I start looking at this I'm beginning to see how truly complicated the design and output of an amplifier can be...