Aiphone AI-900 External speaker connection, Internal/External speaker selection switch

12.4. AI-MS900 Master Station Connection and Adjustment

12.4.1. External speaker connection

Follow the procedures below when connecting an external speaker (8Ω).

Step 1. Remove the AI-MS900's rear terminal cover and set the internal slide switch to the [EXT. SP] position.

Internal/External speaker selection switch

Terminal cover

EXT.SP terminal

Microphone sensitivity control

Internal speaker volume control

Step 2. Connect the speaker cable to EXT.SP terminal.

Speaker cable

Step 3. Replace the removed terminal cover in place.

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.

26