Sony HT-NT3 Operating Instructions Manual page 50

Subwoofer
 On/standby indicator

Lights off: Power is off.

Red: Not connected to Bar
Speaker (standby mode).

Green: Connected to Bar Speaker
(SECURE LINK connection is not
established).

Orange: SECURE LINK connection
is established.
  (on/standby)
 SECURE LINK (page 36)
 AC power cord (mains lead)
50
US
About the standby mode
The subwoofer enters standby mode
automatically and the on/standby
indicator turns red when the Bar
Speaker is in standby mode or wireless
transmission is deactivated. The
subwoofer turns on automatically when
the Bar Speaker is turned on and
wireless transmission is activated.