The Gentner DH20 is a specialized telephone/radio broadcast console engineered for managing live callers and integrating telephone audio into professional broadcast environments, such as radio talk shows, news programs, and television broadcasts. It serves as the central interface for producers and engineers to screen, mix, and process multiple telephone lines before they are sent on-air. The unit prioritizes broadcast-quality audio, reliability, and operational control to ensure clear, intelligible caller audio that meets professional transmission standards.

Its functionality includes multi-line capability, allowing multiple callers to be held, screened, and selectively brought to air. Key features typically include hybrid circuits to eliminate echo, dynamic processing like limiting and equalization tailored for voice, and built-in delay for live broadcast safety. The console provides tactile control for the producer, with dedicated buttons for line selection, cueing, and switching, enabling precise management of live interactions between hosts and callers.

Built for the demanding pace of live broadcasting, the DH20 is known for its robust construction and straightforward, reliable operation. It consolidates complex telephony and audio processing tasks into a single, purpose-built unit, forming an essential component in any broadcast facility's on-air chain for live audience interaction and remote interviews conducted via standard telephone lines.