The Rane AD 22 is a professional two-channel digital audio delay processor, providing precise time alignment for sound reinforcement and installed audio systems. Its primary function is to introduce a controlled time delay to an audio signal, which is essential for correcting phase issues when multiple loudspeakers are located at different distances from the listener, aligning the sound from delayed speaker clusters with the main PA in large venues, or syncing audio with video in broadcast and cinema applications. The unit offers a wide delay range, adjustable in fine increments, allowing system technicians to time-align speakers with great accuracy, resulting in improved clarity, tighter bass response, and a more coherent sound field throughout the listening area.

Each channel operates independently and features straightforward controls for setting delay time, input gain, and output level. A particularly user-friendly feature is the ability to set the delay based on either time (in milliseconds) or distance (in feet or meters), with the unit automatically calculating the corresponding value. This simplifies the setup process during system tuning. The AD 22 utilizes high-quality analog-to-digital and digital-to-analog converters to maintain signal fidelity, ensuring that the delayed output is a clean, accurate replica of the input. The front panel includes a clear digital readout and data entry controls for precise adjustment, along with status indicators for power, signal presence, and bypass.

Housed in a single rack unit with a durable steel chassis, the AD 22 features balanced XLR and 1/4" TRS inputs and outputs for flexible integration. It is designed for reliability in both permanent installations and touring racks. While not an effects processor for creative delay, it is a critical tool for system optimization. By ensuring that sound waves from all speakers arrive at the listening position in phase, the Rane AD 22 directly contributes to improved speech intelligibility, overall system transparency, and a more accurate stereo or surround image, making it a fundamental component in well-tuned professional audio systems.