The Shure ADX2/B87A is a premium handheld wireless transmitter that integrates a high-fidelity condenser microphone capsule into a dual-channel-capable transmitter body for the Axient Digital wireless system. It represents a top-tier solution for critical vocal applications where broadcast-quality audio, system redundancy, and advanced control are essential. This model is distinguished by its ability to transmit on two independent radio frequencies simultaneously—a primary and a backup—providing unparalleled reliability for live broadcasts, major theatrical productions, and high-profile events where a wireless dropout is unacceptable. The condenser capsule delivers a smooth, detailed, and natural vocal character with exceptional clarity across the entire frequency spectrum.

The dual-channel transmission, often referred to as "true diversity transmission" at the source, is the cornerstone of its reliability. By broadcasting the same audio on two separate frequencies to a compatible dual-channel or twin-receiver setup, the system can automatically and instantaneously switch to the cleanest audio signal if interference is detected on the primary frequency, with no audible glitch or dropout. This provides a level of signal integrity assurance that goes beyond standard receiver-based antenna diversity. The transmitter incorporates the full suite of Axient Digital intelligence, including remote control and monitoring via ShowLink, and sophisticated spectrum management for operating in the cleanest available RF space.

Constructed with a robust metal body and hardened steel grille, the transmitter is built for the rigors of professional touring. It features a high-contrast OLED display for clear visibility of settings such as frequency, battery status, and RF power levels for both transmission paths. Power is supplied by a high-capacity rechargeable lithium-ion battery designed to last through extended events. The ADX2/B87A, by combining a superior-sounding condenser microphone with groundbreaking dual-transmission technology, is engineered for the most mission-critical applications where absolute audio performance and unwavering wireless reliability are the foremost requirements.