STM-3

RDL STM-3 - High-Gain Microphone Preamplifier

The RDL STM-3 is a high-gain, low-noise microphone preamplifier designed for surveillance, commercial sound, broadcast, and recording applications where greater-than-normal gain is required. It offers adjustable gain from 45 to 75 dB, making it ideal for low-output microphones and demanding audio environments.

The unit features two balanced or unbalanced line-level outputs and supports both high and low impedance microphones. Phantom power is available for condenser microphones, and RF-filtered inputs ensure clean signal performance. The STM-3 operates on 24 Vdc (or 12 Vdc with reduced headroom) and drives both high and low impedance loads.

Functionality

• High microphone gain: 45-75 dB
• Supports high and low impedance microphones
• Two balanced or unbalanced line outputs
• Phantom power capability
• RF-filtered input
• Adjustable output level

Features

• Device type: high-gain microphone preamplifier
• Gain range: 45-75 dB (adjustable)
• Input: mic-level, balanced or unbalanced
• Outputs: 2x line-level, balanced or unbalanced
• Phantom power: available (external)
• Power supply: 24 Vdc (12 Vdc with 6 dB headroom reduction)
• Distortion: very low
• Noise: very low
• Output load: high or low impedance

The RDL STM-3 is a compact and powerful microphone preamplifier that delivers exceptional performance in applications requiring high gain and low noise. It’s a reliable choice for professional AV, surveillance, and studio environments.