Upgrade D-Prem?

[Mka]

f1eng - I wasn't actually trying to make any assumptions in my last post. My post was in fact made in the hope that it would get a reaction from someone who actually knows some facts! So anyway, it looks like that one worked, your response has clarified much in my mind - thanks! It still leaves the subject of why with some speakers (maybe those that present difficult load), the 240 (250) sounds much better than the 170 (200). Does the extra case allow optimisation in the power / ADH side of things that is not possible with the 170 (200) case? When I tried the 170, then the 240, with Kef Blades the difference was clear, well out of the subjective range. So I am sure there is some kind of difference in nominal SQ performance, even if it is limited by software optimisation rather than the electronics as such?

As early adapter we pay a premium. Development hast to be paid and it was always a bit expensive to be the first with a new technology. However it is hard to see how much the prices of the d-premier have already dropped .... I bought my second as brand new NOS which I have send in for an update for 4200€ -
Most of the tonal differences can be probably explained by psychoacoustic phenomena . The nice shiny handmade chrome enclosure just sounds better -