Dual Mono mode
Sonos Amp and Port may optionally output mono instead of stereo. Dual Mono is ideal when speaker placement is not suitable for stereo listening (e.g. open spaces or outdoor configurations). When in this mode, a mono signal is sent to all speakers regardless of connection to an L or R terminal.
On iOS or Android:
- Open the Sonos app.
- From the Settingstab, press System.
- Select the room where Amp or Port is located.
- Press Stereo/Mono.
- Press Dual Mono.