In addition to being a good guy, I really think Jan is having some fun with all of the headphone stuff. It offers him new challenges and a new market to explore. He is still feeling his way ahead in finding the best approaches for matching his amp to headphones, and he is very open-minded to ideas from this community, just like he has been open to ideas on powering the amp, most of which have come from the speaker people on Audio Circle. That's the right way to do business, even though there are many designers of audio products who think they are so much smarter than their customers that they don't need to listen to the anybody's inputs. While I am sure that some of them are true geniuses, they might discover that if they ignore their customers they won't make a living despite their brilliance.
Mike's suggestion of hard-wiring the box on the amp side vs. using binding posts might have both sonic and cost merit -- there are fewer connections and less hardware, and those are usually good things for both improving sound and saving costs. But there's really only one way to find out for sure... just do it (sorry for violating any trademarks). And if Mike's idea does work well, then Jan can make it the standard approach and the community benefits -- and he sells more amps and boxes. What a concept!