... Over a year ago I outlined and summarised Toole’s explanation of how and why we have been conditioned to be pretty happy with pretty little. ...
This discussion emerges and re-emerges on many related subjects, and I find it interesting. Well, interesting enough to buy a multi-channel DAC when my old one died, but not urgent enough to go any further just yet. Reasons for non-urgency probably align with lack of uptake of loudspeaker multi-channel by the wider public (note this isn't a suggestion that their is much general uptake of stereo hi-fi either) around things like cost, complexity, space, clutter and (in my case but not everyone's) a raft of other things being on the to-do list.
That aside, the claims about relative fidelity of multi-channel for music are (most?) often advanced by people who like to listen to music genres typically performed live, like orchestra, jazz, acoustic or amplified acoustic ensembles and so on. While that's not my thing I think the discussions are credible at least.
But I listen to material that is assembled in-studio, primarily from synthetic sources (or otherwise heavily modified electronic outputs from more traditional instruments) sometimes with some acoustically-sourced elements. Where these are composed and assembled on a two-channel system I don't see the argument for multi-channel reproduction being higher-fidelity, by definition. People may enjoy upmixing and playback on multi-channel, but that is an aesthetic preference.
Now we may be in a transitional period where more and more mixing is done for multi-channel targets. Which means headphones for most people. And I enjoy that too. Music that's actually composed for multi-channel would presumably sound better reproduced that way.
The upshot is that the comparison between stereo and multi-channel qua fidelity is source-dependant, not absolute.
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