of course I talked about analog EQ just to give the most basic example of what is really just the amplitude and phase relation of any sine and how we can ultimately, kind of transfer the data from one to the other to make time look better while keeping the same absolute resolution. I wasn't inferring in any way that MQA's modus operandi was that limited. it's just that I've argued about EQ with
@goodvibes and knew he would get that example.
for the all situation, we'd have to consider aliasing/where to achieve practical band limiting/sample rate, FR/bit depth, ringing/phase, as related components of what gives the final resolution(am I missing something?). so there is a lot to play with, and indeed the digital+analog filters open a lot of doors. a chance to really control the entire chain could be ideal for that, but would really limit post processing to make the album. that's why I don't see that part happening as a standard of anything.
everybody so far went with trying to stick as close as possible to Nyquist-Shannon's less than ten commandments ^_^. and by doing so, ringing outside the audible range was almost always the one to drink at least at low sample rates. MQA and a few other guys have other priorities and say that ringing no matter where is the worst thing that happened to music since Lil B. so which variable is going to pay instead? amplitude is a certainty with less bits. FR is highly probable, the real question being when does the roll off start and does it matter? aliasing? well that will depend on FR. it's nothing new, what changed is the anti-ringing obsession for a minority of people.
all that is splitting air about true fidelity of course. because it's all happening at high frequency and sample rate. on MQA the lowest is 96khz, I'll be the first one to say that I don't care and really don't find any of it really wrong. I'm very fine with gentle roll off in DACs when playing high sample rate music, or whatever more advanced filter they decided to implement. so I'm personally fine with pretty much anything including MQA in the sense that I do not believe it will change audio for me in any way. that's about the only support I can offer to MQA. "it will do nothing for me". every other aspects make me dislike MQA and wish it was already gone.