Actually when I mentioned X3000 series I meant the current X3200W and newer, i.e. anything that meets HDCP2.2, basically anything older would be too old to mention, they probably won't even do 4K, let alone Atmos etc.....
Similarly, for the SR6011 and older, in fact the SR6010/6011 doesn't even have the 32 bit AK4458.. not that it would make any difference as the 24 bit PCM1690 is quite decent, but it's a criteria that made the 6010/6011 clearly one notch below the X4200/4300H. The thing is, HDAM, AL32, DDSC etc., what audible do they make? Nothing right? If they do, you (not you), then you are firmly in the golden ears group, and believe all amps sound different
regardless..
At the end of the day, Price point, reliability track record, features, look, specs and bench test data are far more real, at least objective, except the "look" part obviously.