Reasoning like that there's no logic in any of it and a D800 for example wouldn't need to be €10,000 more expensive than a D400. 
All differences are mostly semi artificial. D200 and D250 hardware is identical except for the case. They've made some modifications to that same hardware for the 120 (removed an input or two, lowered it's maximum power output in software and made some changes to the D-AMP board and some other stuff) to artificially deflate the price. Cost/parts wise though they'll probably save €15 or so which in reality will never be saved because of the overhead costs of producing more than one hardware revision at once.
All differences are mostly semi artificial. D200 and D250 hardware is identical except for the case. They've made some modifications to that same hardware for the 120 (removed an input or two, lowered it's maximum power output in software and made some changes to the D-AMP board and some other stuff) to artificially deflate the price. Cost/parts wise though they'll probably save €15 or so which in reality will never be saved because of the overhead costs of producing more than one hardware revision at once.
PS Audio P3, Shunyata ΞTRON Alpha Digital and HC/Furutech power cables, Paul Hynes SR7EHD-MR4, DIY Roon Server & Roon Endpoint running AudioLinux Headless, Phasure Lush^2 USB cable, Audioquest Diamond RJ/E ethernet, Uptone Audio etherREGEN, Mutec MC-3+ USB, Shunyata ΞTRON Anaconda Digital XLR AES/EBU, Devialet Expert 250 Pro CI, Nordost Tyr Reference LS cables, Von Schweikert VR-5 SE Anniversary Edition, Anti-Mode Dual Core 2.0, JL Audio Fathom F112. More detail here.
The Netherlands
The Netherlands
