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Sennheiser Communications
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FAQ - Mac Systems
What should I do if the microphone in my analogue PC 20, 30, 110, 120, 130, 140, 150 or 160 headset is not working?

Our analogue headsets (PC line) require a standard 3.5 mm mini jack headphone output socket and a standard 3.5 mm mini jack microphone input socket.

We know that some Mac models do not have a microphone input only a "line in" but to use analogue headset you need a standard microphone interface, not a line in.

Therefore please use one of the following solutions:

  1. Buy one of our PC USB line headsets PC (135-145-M145-155-165)
  2. Buy a iMic universal audio adapter from Apple Store
  3. Buy a Mac USB compatible sound card

Diagramme below shows wiring for standard microphone interface:

Source: Apple