"Vision" is to "visually", as "hearing" is to what? [duplicate]
Technically probably "aurally", perhaps "audibly" would be better — or just "stunning audio".
If it is visibly stunning, then it should
Aurally stunning
"Auditorily" seems to fit well.
I would say "acoustically", since Merriam-Webster defines acoustic as " relating to the sense or organs of hearing, to sound, or to the science of sounds".