Hi Micro,
I like the way you’ve described it: “not real itself but recreating (a) perception of the real”. I consider a stereo system to be “Other” to the music. That is, it exists separately from the music, because music is a neurophysiological phenomena that occurs inside (a very specific and dedicated part of) our head. Because music originates in the mind (indeed, research has shown simply thinking about music triggers the same neural clusters*), and can only ever be processed in the mind - it’s a perceptual phenomena - the necessity of the mechanism is Other. It’s not a requirement. If the estimates are true that the earliest musical instruments are 40,000 years-old, then it’s clear the part of our brain that’s developed to process music exclusively wasn’t waiting for the geniuses at Bell Labs to get it together. Had the phonograph never been invented we would still see the same neural clusters firing when processing music - even when there's no music playing.
Live music, whether it be Gergiev conducting the RCO in Amsterdam, or an EDM set at Glastonbury, is sound until it’s deciphered by a human being. There is no system, and likely never will be, that will capture or reproduce that sound in our homes. But “the objectives of sound reproduction” fails to articulate the reason it was invented in the first place - to record and playback ‘music’. Sonically, all systems come short, that’s something perhaps we could all agree on. How short is something that I believe is best articulated not by reporting from individuals trained to listen for specific anomalies, nor by comparison based on anecdotal examples - though both are helpful for the larger cultural pursuit (like we do here). The most scientifically robust way - the most “systematically straightforward and predictable way” as you put it - is not to measure the mechanism, but the neuro-physiological originator of the phenomenon itself which also happens to be the only device in the world that can separate ‘music’ from ‘sound’.
Thankfully, as research is indicating, our brains do this incredibly well, and do not need sonic fidelity in order to figure out whether the airwaves are music or not. Like you say, perception is reality because we are never not perceiving. It’s an indelible part of consciousness that’s always being modulated by a brain hardwired to create new synaptic links. It’s why we’re able to be deceived as much as we are enlightened.
That we derive so much enjoyment from the audio reproduction mechanism, as flawed as it is, tells me much more about human nature and our brain’s incredible capacity for discerning meaning in non-sentient phenomena than it does our systems. It’s not hard to measure a component, and not hard to compare the waveforms of the format with the waveforms produced at the speaker/room interface - but they’re mostly telling us about the measurements. Should FMRI scanning become the standard by which the ‘fidelity’ of the reproduction mechanism is adjudged, we may be able to move beyond the ‘sound’ of our systems and figure out how well they reproduce ‘music’.
But alas, I’m repeating myself here (and in less than 400 posts - how do you guys get to 1,000 and avoid… oh, wait), so I shall continue to occupy myself with servitude toward a large multinational corporation that's attempting to convince you its products are essential to your wellbeing.**
*“Measuring the representational space of music with fMRI: a case study with Sting”, Daniel J. Levitin & Scott T. Grafton, 12 August 2016, Neurocase
** (They’re not.)