The Clear-Com SB-440 is a professional-grade, 4-channel intercom switchboard designed for high-performance communication in live production, broadcast, and theater environments. Part of Clear-Com’s advanced 440 series, the SB-440 features a versatile switching matrix that allows up to ten station groups to be assigned to any of the four intercom channels, offering unmatched flexibility. Each channel includes independent talk and listen buttons, individual volume controls, and visual call signaling for intuitive operation. The unit supports “All-Talk” functionality and channel linking, enabling seamless group communication during rehearsals or live events. Built-in IFB program interrupts and a “Hot Mic” output streamline talent cueing and external audio routing. With a wide-range, high-output speaker, adjustable mic proximity compensation, and short-circuit protection, the SB-440 delivers superior audio clarity and reliability in demanding acoustic environments.