RDL STM-1 Microphone Preamplifier, 50 dB Gain

Bring microphone audio up to professional line level with the Radio Design Labs STM-1 microphone preamplifier — a compact, high-performance solution built for commercial sound, broadcast and security installations. The STM-1’s fixed 50 dB gain removes guesswork, delivering consistent levels to feeding mixers, recorders or surveillance recorders and reducing setup time on live events or monitoring deployments. Its balanced or unbalanced outputs and phantom capability let you connect dynamic or condenser mics without extra adapters, while RF-filtered inputs and outputs preserve intelligibility in noisy RF environments common to surveillance and remote monitoring. The unit operates from 24 V DC (operation at 12 V is possible with a 6 dB headroom reduction) and supports a wide frequency range of 50 Hz–30 kHz to maintain natural voice and program fidelity. Small form factor and STICK-ON® mounting make the STM-1 ideal for cramped control rooms, intercom panels or covert security housings. Ideal for security, surveillance, broadcast and facility monitoring — add the STM-1 to your next installation to ensure clean, reliable mic signal gain.

• Consistent, ready-to-use 50 dB gain that brings any mic-level source reliably to line level for predictable system performance
• Compact, lightweight design for easy installation in tight racks, panels or covert surveillance enclosures
• Balanced or unbalanced outputs and phantom capability for flexible integration with broadcast, security and intercom systems
• RF‑filtered inputs/outputs and wide 50 Hz–30 kHz response for clear, interference‑free audio in monitoring and surveillance environments
• Low-voltage 24 V DC operation (works at 12 V with reduced headroom) and STICK-ON® convenience for fast field deployment