STM-1

RDL STM-1 - Microphone Preamplifier - 50 dB Gain

The RDL STM-1 is a compact microphone preamplifier designed for commercial sound and broadcast applications. Its small STICK-ON® form factor makes it ideal for installations where space or weight is limited.

The high-performance circuit provides a fixed 50 dB gain, bringing mic-level signals up to line-level for compatibility with most line inputs. The input supports both high and low impedance microphones, and the output can be configured as balanced or unbalanced. RF-filtered inputs and outputs ensure clean signal transmission. The unit operates from a 24V DC power supply, with optional 12V DC operation (with 6 dB reduced headroom). It can also be used in intercom systems, where the input may be driven directly from a speaker.

Functionality

• Fixed 50 dB gain - ideal for converting mic-level to line-level signals
• Supports high or low impedance microphones
• Balanced or unbalanced output
• Phantom power capability
• RF-filtered inputs and outputs for clean signal transmission
• Compact STICK-ON® design for easy integration

Features

• Device type: microphone preamplifier
• Input: high or low impedance microphone input
• Gain: fixed 50 dB
• Output: balanced or unbalanced
• Power supply: 24V DC (recommended), 12V DC operation possible (with 6 dB reduced headroom)
• Phantom power support: yes
• RF filtering: yes (on inputs and outputs)
• Operating temperature: 0°C to 55°C

RDL STM-1 is a reliable and cost-effective solution for AV professionals needing a compact, fixed-gain microphone preamp with high-quality performance. Ideal for intercoms, commercial sound systems, and broadcast applications.