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The sound system accepts inputs from three possible sources:
The sound signal from the built-in microphone goes through a dedicated preamplifier that raises its signal level to the nominal level of the codec circuits in the Burgundy IC.
The external sound input jack is a 3.5-mm mini phone jack located in the I/O bay on the right side of the computer. The sound input jack accepts line-level stereo signals or an Apple PlainTalk microphone. It also accepts a stereo miniplug-to-RCA cable adapter for connecting stereo equipment to the computer.
The sound input jack has the following electrical characteristics: