I will know sometime by mid Jan how good the amps will be. How can my measly $1000-$1200 Ice power amp sound as good as your $15,000 jobbie?.....he he. We shall see. I don't except it to be as good as yours but you never know. I have a friend in Berkeley who bought the 302 on my recommendation and I can go there anytime to A/B. Trouble is, he uses balanced in and my amp probably won't do balanced (at least the first version probably won't)....anything is possible....just the beginning. I am sure you will love your 320/4....
Yes, I use a single ended class A mosfet stage to drive headphones...pretty darn good. No, I don't want to build you one. I want to concentrate on the amp. BTW, the amp will have optional built-in Ultimate Attenuators, so could be used as a headphone amp.....he he. Two hundred and fifty watt headphone amp.....just slightly overkill!