Sony HT-MT300 Operating Instructions Manual page 8

Indicators Status
• Flashes twice: The audio channel is set to Main/Sub (page 24).
8
GB
• Flash three times: The volume/subwoofer volume level is set to
maximum/minimum.
• Flash repeatedly: The sound is muted.
• Flash for 10 seconds and the system is turned off: The
protection feature is activated (page 30).
• Flash slowly: The system enters standby mode by the
auto standby function.