| Microphone | Tip | Ring | Sleeve |
| Silicon Graphics supplied electret mono microphone |
Signal (+) | Signal (+) NC (no connection) |
Ground (-) |
| Line level mono microphone | Ground (-) | Signal (+) | Ground (-) |
| Microphone Jack |
|
| Connector |
3.5 mm stereo mini (mono signal on tip and ring) |
| Power |
+5 phantom power on tip |
| Type |
Unidirectional electret condenser |
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