Aiphone AI-900 - Manual (Page 26)

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12.4. AI-MS900 Master Station Connection and Adjustment
12.4.1. External speaker connection
Follow the procedures below when connecting an external speaker (8 Ω).
Step 1. Remove the AI-MS900's rear terminal cover and set the internal slide switch to the [EXT. SP] position.
Terminal cover
EXT.SP terminal
Microphone sensitivity control
Internal speaker volume control
Internal/External speaker selection switch
Step 2. Connect the speaker cable to EXT.SP terminal.
Speaker cable
12.4.2. Internal speaker volume and microphone sensitivity adjustment
The AI-MS900's internal speaker volume and microphone sensitivity can be adjusted by means of their
respective controls located under the terminal cover described above. Both controls are factory-preset to their
maximum positions.
Step 3. Replace the removed terminal cover in place.