Houses the massive transformer, the primary AC-to-DC switching power supply (SMPS) board, and the Class D digital amplifier circuitry.

Logitech Z906 5.1 Channel THX Certified Speaker System - Scorptec

button for 5 seconds. The system will cycle an audible test signal through each speaker individually (Left Front, Center, Right Front, Right Rear, Left Rear, Subwoofer). Hard Reset (Console)

If one or more speakers are not producing sound:

Check electrolytic capacitors (like C38, C39, and C40) for bulging or leaking, as long-term heat exposure significantly degrades their lifespan. Preventive Cooling Measures