Shure QLXD2/KSM9 Handheld Wireless Transmitter X52

QLXD2/KSM9 Handheld Transmitter with KSM9 Capsule
The QLXD2/KSM9 is a handheld wireless microphone transmitter built for QLX-D Digital Wireless Systems, pairing Shure's respected KSM9 condenser capsule with a digital transmitter engineered for clarity and reliability. It delivers transparent 24-bit digital audio quality while making highly efficient use of RF spectrum, a combination that matters for performers and audio engineers working in increasingly crowded frequency environments. Available across G50, H50, J50, and AV50 frequency bands, the transmitter is designed to sync quickly with a compatible receiver and hold a clean, uninterrupted signal throughout its operating range. Built with rugged metal construction, it's intended for the demands of touring, broadcast, and other professional live-sound settings where dependability is non-negotiable.

Digital Audio and RF Performance
At the core of the QLXD2/KSM9 is its 24-bit digital audio quality, which preserves fine detail and dynamic nuance in a vocal or spoken-word signal. The transmitter offers over 120 dB of dynamic range, which means no manual transmitter gain adjustment is needed — a real convenience for engineers managing multiple channels under time pressure. RF output power is selectable between 1 mW and 10 mW, giving operators flexibility to balance battery life against transmission range depending on the venue. Syncing to a receiver is handled over infrared with a simple push of a button, reducing setup time before a show or session. Together, these features are built to maintain a clear, uninterrupted signal across the full operating range, even in RF-dense environments.
Security and Onboard Control
For situations where signal integrity and system security matter, the QLXD2/KSM9 includes AES 256-bit encryption for secure wireless transmission, protecting audio from interception. Day-to-day operation runs through a backlit LCD with an easy-to-navigate menu and controls, and the display is selectable to show group/channel information, frequency, or battery runtime depending on what the operator needs at a given moment. A frequency and power lockout feature helps prevent accidental changes once settings are dialed in, which is especially useful in multi-user or touring environments where consistency is critical.
Power Management and Build Quality
Power flexibility is built into the system through an optional Shure SB900B lithium-ion rechargeable battery, which reports remaining runtime in hours and minutes directly on the LCD — removing the guesswork around when a mic will need fresh power mid-show. External charging contacts allow for convenient docked charging, streamlining battery management for touring and installed systems alike. All of this is housed in rugged metal construction, reflecting the durability expectations of professional touring and broadcast use. As with any QLX-D component, frequency bands must be matched across paired wireless devices to ensure proper system operation.
Why We Love This
Our gear experts appreciate the QLXD2/KSM9 because it gets out of the way and lets them perform. Transparent 24-bit audio and over 120 dB of dynamic range mean vocals come through naturally, without fiddling with gain. Quick IR syncing gets them on stage faster, while AES 256-bit encryption keeps their signal private. The rugged metal build survives touring life, and runtime readouts on the battery mean no surprise dropouts mid-set — just reliable, professional-grade sound night after night.
Features:
- 24-bit digital audio quality
- Highly efficient RF spectrum usage
- One-touch IR syncing with a wireless receiver
- Clear, uninterrupted signal across the entire operating range
- AES 256-bit encryption for secure transmission
- Over 120 dB of dynamic range (no transmitter gain adjustment needed)
- Selectable 1 mW / 10 mW RF output power
- Optional Shure SB900B rechargeable battery with runtime readout in hours and minutes
- Backlit LCD with selectable display (group/channel, frequency, or battery runtime)
- Rugged metal construction with frequency and power lockout