Shure ADX2FD/B58 – Axient Digital FD Handheld Transmitter with Beta 58A

Product Overview

The Shure ADX2FD/B58 is Shure’s top-tier Axient Digital handheld wireless transmitter, combining Frequency Diversity simultaneous dual-carrier transmission with ShowLink remote control and the Beta 58A dynamic supercardioid capsule. Frequency Diversity transmits on two independent UHF frequencies simultaneously, ensuring uninterrupted audio even in the most congested RF environments — making the ADX2FD/B58 the appropriate choice for mission-critical commercial AV installations such as houses of worship, large auditoriums, and broadcast productions. Available in G57 (470–616 MHz) with AES-256 encrypted digital audio and 2-ms selectable latency.

Product Description

The ADX2FD platform represents Shure’s highest-performance handheld transmitter tier, and the Beta 58A capsule is one of the most specified dynamic supercardioid elements for live sound reinforcement in professional AV. The Beta 58A’s supercardioid pattern provides tighter off-axis rejection than a standard cardioid, delivering higher gain before feedback and greater isolation from stage and ambient noise in multi-mic environments. Frequency Diversity operates by transmitting the same audio on two independent RF carriers simultaneously; if one carrier experiences interference, the system maintains audio continuity without audible dropout. Single-carrier mode is available when FD is not required, restoring full 2/10/50 mW power options. The SB920 rechargeable battery provides up to 9 hours in single-carrier mode or 6.5 hours in Frequency Diversity mode. External charging contacts support multi-bay networked charging via Shure’s SBC840 or SBC220. For a compatible receiver, see the Shure AD4DNP Two-Channel Digital Wireless Receiver. For a single-carrier alternative with the same ADX2 ShowLink features, see the Shure ADX2/SM58.

Key Features

• Frequency Diversity Transmission — Simultaneously transmits on two independent UHF carriers; if one frequency encounters interference, audio remains uninterrupted without audible dropout, critical for mission-critical AV productions.
• Beta 58A Dynamic Supercardioid Capsule — Neodymium magnet delivers high signal-to-noise output; brightened midrange and bass roll-off provide natural proximity effect control for close-up vocal reinforcement.
• ShowLink Remote Control — Enables real-time wireless adjustment of gain, RF output, mute, and other transmitter parameters from the FOH position using the AD610 access point and Wireless Workbench 6.
• AES-256 Encryption — Secure digital audio transmission for government, corporate, and broadcast AV installations where transmission security is required.
• Selectable RF Output (2/10/20/50 mW) — Includes FD-mode power levels (2×2/10×10/20×20 mW) and single-carrier levels (2/10/50 mW), supporting up to 100 m (328 ft) line of sight.
• 146 MHz Tuning Range — Wide UHF tuning within the G57 band allows system designers to coordinate large channel counts and avoid interference in congested RF environments.
• Up to 9 Hours Battery Life — SB920 rechargeable lithium-ion battery provides 9 hours in single-carrier mode (10 mW) and 6.5 hours in Frequency Diversity mode (10×10 mW), with precision time-remaining metering.
• Hardened Steel-Mesh Grille — The Beta 58A’s grille resists wear and abuse in demanding live sound and touring production environments.
• IR Sync — One-touch infrared synchronization with Axient Digital receivers accelerates system setup and frequency coordination during installation.
• Interchangeable Capsule Design — The Beta 58A capsule can be replaced with any compatible Shure wireless capsule (KSM9, KSM8, SM58, Beta 87A, Beta 87C, and others) without tools.
• High-Density Mode — Supports maximum simultaneous channel counts in spectrum-limited venues alongside standard coverage mode.
• Lightweight Aluminum Housing — 338 g (11.9 oz) without battery; durable and moisture-resistant for continuous commercial AV use.

Typical Applications

• House of worship main-stage vocal reinforcement requiring interference-proof Frequency Diversity wireless
• Auditorium and performing arts venue productions where mission-critical RF reliability is non-negotiable
• Broadcast studio and live-event production requiring AES-256 secure wireless audio with ShowLink management
• All-hands room and large-venue corporate AV systems with dense RF environments
• Government space and secure facility deployments requiring dual-frequency RF redundancy

Technical Specifications

Frequently Asked Questions

What is Frequency Diversity and when is it required?
Frequency Diversity simultaneously transmits the audio signal on two independent RF carriers. If one carrier encounters interference, the system maintains audio continuity without any audible dropout. It is appropriate for mission-critical installations — large house-of-worship productions, broadcast events, government proceedings — where any audio interruption is unacceptable. For less critical installations, single-carrier mode is available on the same transmitter body.

Which Axient Digital receivers are compatible with the ADX2FD/B58?
The ADX2FD/B58 is compatible with all Axient Digital series receivers including the AD4D (two-channel) and AD4Q (four-channel). For Frequency Diversity to function, the receiver must support FD mode — verify receiver compatibility when configuring your system.

How does the Beta 58A compare to the SM58 capsule on the same ADX2FD body?
The Beta 58A uses a supercardioid polar pattern (tighter than the SM58’s cardioid), providing higher gain before feedback and better isolation from off-axis sources in multi-mic environments. The Beta 58A’s neodymium magnet also delivers a higher signal-to-noise output than the SM58’s alnico magnet. The trade-off is that the supercardioid pattern requires more precise on-axis mic technique.

Can the Beta 58A capsule be replaced?
Yes. The interchangeable capsule design allows no-tools field replacement with any compatible Shure wireless capsule including the KSM9, KSM8, SM58, Beta 87A, and Beta 87C. Unscrew the existing capsule and thread on the replacement.

What is the warranty on the ADX2FD/B58?
Shure provides a limited 2-year manufacturer warranty. Contact Creation Networks for warranty support and Axient Digital system design consultation.