Can sound quality be defined objectively apart from accurately reproducing what the author intended? And if so, what basis would you use for that?
It's an inherently bedeviling subject because whatever arbitrary objective goal we define - which can be useful - the ultimate goal is subjective impressions.
I think a concept like "Accuracy" or "High Fidelity" can be useful, for instance the goal of reproducing the sonic information contained in the source information (e.g. digital file or whatever) and doing so with as little added distortion as possible - can clearly be very useful. It gives some hope to leaving the subjective morass and allowing objective verification (measurements etc).
On the other hand it seems problematic to meld "Accuracy" with "Sound Quality" because I think the basic notion of "sound quality" springs from subjective impressions and assessment. I think there is a sort of base-level identification of "sound quality" to some degree. ONE such identifier can be "sonic realism." So for instance you play a well recorded saxophone or vocal track through a crappy little blue tooth speaker, and then through a high end system using Revel Salon speakers, which reproduces more of the scale, power, clarity, dynamics and timbral complexity of the real thing, and most people are going to select the Revel system as displaying "higher sound quality." I've yet to play my system, for instance, for non-audiophile guests who weren't immediately impressed by the "higher level of sound quality" than they were used to hearing. (And it's usually accompanied by the guests noting a level of "realism" in the sound they hadn't encountered - "like I'm right there in the studio hearing the person perform!").
"Accuracy" doesn't seem to map directly on to this subjective goal. If you take truly terrible, muffled, thin, scratchy old recordings and play them back through the most "accurate" system in the world...it will still impress the listener as being "poor sound quality." That is after all why we can use accurate systems to talk about what mastering jobs or albums or whatever are poorer or better than others.
The accuracy of a system can of course help elevate sound quality - but ONLY insofar as the source itself has High Sound Quality to begin with - "sound quality" as we subjectively rate such things.
So, as I've said, defining certain goals that are more amenable to objective verification is almost always going to be useful. Hence the usefulness of a certain basic idea of "accuracy" generally used by Amirm and others on this forum.
But anyone paying attention will, I think, notice that "accuracy" in of itself isn't the same as "sound quality" and sound quality is really our overriding goal. Accuracy can be a means to that end...but not always.