Bose 437308 Manual page 62

AP P EN D IX C: CON N E C T E XT E RN AL S O U R CE
3. On the Main amplifier, carefully insert the plug into the OPTICAL IN port.
NOTE: The port has a hinged door that swings inward when inserting the plug.
4. Firmly push the plug into the port until you hear or feel a click.
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