Official documentation guide
How do I choose the microphone source for Mac Dictation?
Short answer
Open Keyboard settings, go to Dictation, and choose the microphone source from the microphone pop-up menu when that option is available.
What the documentation establishes
- Dictation microphone selection is located in Mac Keyboard settings.
- Available choices depend on microphones recognized by the Mac.
Scope and limits
Documentation synthesis; no hands-on testing was performed. Behavior can change with software version, language, permissions, focus, device, and application configuration.