[PRTCT], [PUSH], speaker name ([SUB], [RL], or [RR]), and [POWER] flash alternately in the front panel display.
- Press (power) on the corresponding speaker ([SUB]: optional subwoofer, [RL]: optional left rear speaker, [RR]: optional right rear speaker) to turn each off. For the optional rear speaker, disconnect the AC power cord (mains lead), then restart the speaker system. For the optional subwoofer, disconnect the AC power cord (mains lead) and make sure nothing is obstructing the ventilation holes of the optional subwoofer, then restart the speaker system. If they are reconnected properly, the display in the front panel display returns to the normal display.