@immatthewj
You are not wrong to worry about making sure the wiring and breakers and outlets are all safe to use together.
Breakers must be rated at no more amperage than the wiring can support.
Non-locking, 120V/15A duplex outlets are rated for use in 20A circuits, but the socket doesn’t support the use of a 20A plug, with the rotated hot. From an audio perspective, the 20A outlets are not better. There’s no more metal or grip there than in the 15A units. It is a practical way to tell end users, usually in commercial settings, quickly what they can/cannot plug their big ass vacuum cleaner or dough mixer or whatever into.
However, if you are running 20A dedicated circuits, you might as well use the 20A sockets. :) If you plan to use a dedicated audio circuit with 4 outlets though most electricians would stick to the 15A sockets.
Think of it as 20A sockets are for dedicated 20A circuits with no more devices on it. It says "hey, you can plug in your table saw, and just your table saw, here! We planned for that"
The 15A sockets say "You can plug in a few average appliances to us."
