The Rane AD 22d is a professional two-channel digital audio delay processor designed for precise time alignment and signal synchronization in sound reinforcement and fixed installation systems. Its primary function is to introduce a controllable time delay to an audio signal, a critical tool for correcting speaker alignment issues, synchronizing audio with video, and managing distributed sound in large venues. By digitally delaying the signal sent to specific loudspeakers, an installer can ensure that sound from all speakers arrives at the listener's position simultaneously, eliminating comb filtering and phase cancellation that degrade clarity and intelligibility.

This unit offers high-resolution 24-bit analog-to-digital and digital-to-analog conversion, ensuring transparent audio quality with minimal coloration. Each of its two independent channels provides a wide range of delay time, adjustable in fine increments (often in fractions of a millisecond, feet, or meters), allowing for precise calibration. It typically features both analog XLR/TRS inputs and outputs for easy integration into existing analog systems, as well as digital I/O options like AES/EBU for connection to digital audio networks. User control is facilitated through front-panel navigation and a clear display or via remote software.

Built into a rugged half-rack metal chassis, the AD 22d is designed for reliability in both touring and installed applications. Its straightforward interface allows sound engineers to quickly dial in the necessary delay times for aligning front fills with main arrays, delaying rear fills in large spaces, or syncing audio to a video display. By solving critical timing problems, this processor is an essential tool for optimizing sound system performance and achieving coherent, high-fidelity audio coverage.