The Rane AD 22B is a professional two-channel digital audio delay processor housed in a single rack unit, providing precise time alignment and synchronization for sound reinforcement and installed audio systems. Its primary function is to introduce a controllable time delay to an audio signal, which is essential for correcting phasing issues when multiple speaker clusters are used at different distances from the listener, aligning the sound from distributed speakers with the source on stage (e.g., in a theater), or synchronizing audio with video in broadcast and cinema applications. The unit offers high-resolution digital processing with a wide delay range, typically up to several seconds, adjustable in fine increments (e.g., 0.02 ms steps), allowing for extremely accurate tuning of sound systems.

Each channel operates independently and features comprehensive control over delay time, input gain, and output level. The delay time can be set directly in time units (milliseconds) or calculated automatically by inputting a distance measurement in feet or meters, a highly useful feature for system technicians. The AD 22B is designed for sonic transparency, utilizing high-quality analog-to-digital and digital-to-analog converters to ensure the delayed signal retains the full fidelity of the original source. Its straightforward front-panel interface, with a clear digital readout and data entry wheel, makes it accessible for both setup and real-time adjustments during a sound check.

Built to Rane's professional standards, the unit features balanced XLR and 1/4" TRS inputs and outputs, robust internal power supply, and a durable steel chassis. It serves as a critical tool for system optimization, not for creative effects but for technical correction and integration. By allowing engineers to time-align speakers, the AD 22B ensures coherent wavefront arrival at the listening position, which results in improved speech intelligibility, tighter bass response, and a more accurate stereo or surround image. It is a fundamental component in the signal chain of any well-tuned large-scale PA system, fixed installation, or broadcast facility.