On iOS, you can activate Siri by saying “Hey Siri.” Vocal activation isn’t available on macOS Sierra through the Siri system preferences, but as Jdcampbell on Reddit points out, it can be done through Sierra’s Accessibility system preference.
Essentially, you use dictation to activate the keyboard shortcut for Siri. The default Siri keyboard command in Sierra is to hold down the Command and Space buttons. You need to change this because the Accessibility feature doesn’t have a way to hold down a keyboard combination.
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