The CX-D6721S is a professional rack-mounted power sequence controller designed for managing the power supply sequence of multiple audio and AV devices in commercial sound systems. It is suitable for public address systems, conference rooms, studios, broadcast environments, auditoriums, hotels, schools, and professional AV installations. By controlling the order of power activation and shutdown, it helps protect connected equipment from current surges and improves overall system reliability.

This controller provides 8 relay-controlled power outputs and 2 direct outputs, allowing multiple devices such as amplifiers, mixers, processors, and other rack equipment to be managed from a single unit. It features an LCD voltage display for real-time monitoring, independent channel switching, sequential power-on and reverse power-off operation with a 1-second interval between channels, and supports up to 13A per channel with a total current capacity of 30A.