Audiophile Receptacle question

Well, since you've stated that you're going to convert your garage into a listening space, it does make sense that before you put up your walls, installing decent romex and receptacles would be one of the first steps you'd take, since it's all exposed down to the studs.

I don't have the experience you're seeking but others will chime in soon enough.

All the best,
Nonoise

This should be the last thing you worry about. Isolation from other sound sources, and room acoustics should come first.