iMac Pro Audio

The Tech Specs page where Apple shares stuff with us only mentions this:

Stereo speakers
Four microphones
3.5 mm headphone jack

Next to this:

iMac Pro is as epic to your ears as it is to your eyes. Its enhanced stereo speakers deliver broad frequency response, rich bass, and more volume. So you’ll be able to hear that crashing cymbal, multilayered effect, or sample-based sound, all with remarkable fidelity.

That may be anywhere between 15 and 25 Watt.

Perhaps that is all you need to know, but the number of microphones, coupled with the board-id of the iMac Pro (Mac-7BA5B2D9E42DDD94) leads to data for the Cirrus Logic CS42L83 and Texas Instruments TAS5764 chips. Here’s an XML snippet from BridgeAudioSP.driver

	<key>Underlying Devices</key>
	<dict>
		<key>Bridge Loopback</key>
		<dict>
			<key>Properties</key>
			<dict>
				<key>canBeDefaultSystemDevice</key>
				<true/>
				<key>canBeDefaultDevice</key>
				<true/>
				<key>transportType</key>
				<real>1651274862</real>
			</dict>
		</dict>
		<key>Digital Mic</key>
		<dict>
			<key>Properties</key>
			<dict>
				<key>canBeDefaultSystemDevice</key>
				<true/>
				<key>canBeDefaultDevice</key>
				<true/>
				<key>transportType</key>
				<real>1651274862</real>
			</dict>
		</dict>
		<key>CS42L83</key>
		<dict>
			<key>Properties</key>
			<dict>
				<key>canBeDefaultSystemDevice</key>
				<true/>
				<key>canBeDefaultDevice</key>
				<true/>
				<key>transportType</key>
				<real>1651274862</real>
			</dict>
		</dict>
		<key>TAS5764</key>
		<dict>
			<key>Properties</key>
			<dict>
				<key>canBeDefaultSystemDevice</key>
				<true/>
				<key>canBeDefaultDevice</key>
				<true/>
				<key>transportType</key>
				<real>1651274862</real>
			</dict>
			<key>Parameters</key>
			<dict>
				<key>OutputVolumeScalarMin</key>
				<real>0.1</real>
				<key>OutputVolumeScalarMax</key>
				<integer>1</integer>
			</dict>
		</dict>
	</dict>

Additionally. There is one more board-id that Apple is prepping up for release and that is Mac-CF21D135A7D34AA6. This one comes with only one microphone, and also links to the Maxim MAX98706.

		<key>MAX98706</key>
		<dict>
			<key>Parameters</key>
			<dict>
				<key>OutputVolumeScalarMin</key>
				<real>0.1</real>
				<key>OutputVolumeScalarMax</key>
				<real>1</real>
			</dict>
			<key>Properties</key>
			<dict>
				<key>canBeDefaultSystemDevice</key>
				<true/>
				<key>canBeDefaultDevice</key>
				<true/>
				<key>transportType</key>
				<real>1651274862</real>
			</dict>
		</dict>

The data itself is not so important, for most people, but why is Apple preparing/sharing data for another product, with board-id Mac-CF21D135A7D34AA6, at a time that we only expect the new iMac Pro in December?

Note: The HomePod isn’t running on macOS High Sierra so that’s not it.

2 thoughts on “iMac Pro Audio

    • I’m afraid not. I re-checked this and this board-id was previously used in the leaked firmware (10.13 High Sierra Beta) for a MacBook Pro, but the Intel microcode and (old) CPUID made no sense at that time.

      Apple may change data anytime, but for now, it’s not matching with a Mac mini.

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