Skip to main content
RDL STM-3 High Gain Microphone Preamplifier
RDL STM-3 High Gain Microphone Preamp

RDL STM-3 High Gain Microphone Preamp

SoundPro Item: 77479
  • Videos

  • RDL STM-3 High Gain Microphone Preamplifier
MSRP: $314.13
Add to Wish List

Account manager
Contact an Account Manager for your personalized price

The STM-3 is a quality low-noise microphone preamplifier designed for use in surveillance, commercial sound, broadcast, and recording where higher than normal gain is required. The STM-3 is very flexible, with gain adjustment from 45 to 75 dB, two balanced or unbalanced outputs, and available phantom supply input. Its low-distortion and low-noise performance make it the best choice, even when larger preamps could be used. The STM 3 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. Each output drives high or low impedance loads.

RDL STM-3 Features

  • Low-noise, high-gain, mic preamp
  • Adjustable output levels
  • High or low impedance mic inputs
  • Mic input to line outputs
  • Two balanced or unbalanced outputs
  • Phantom capability
  • RF-filtered inputs
  • STM-3 high gain microphone preamplifier1
  • Input500 Ω balanced; 5 kΩ unbalanced
  • Phantom24 Vdc; IEC 61938: 2013, Filtered
  • Outputs (2)+4 dBu 150 Ω balanced; -10 dBv unbalanced
  • Frequency Response50 Hz to 30 kHz (± 1.5 dB)
  • GainAdjustable 45 to 75 dB
  • THD+N<0.05% (50dB gain)
  • CMRR>50 dB (50 Hz to 20 kHz)
  • Residual Noise< -70 dB (below +4 dBu; 150 Ω source)
  • Headroom> 20 dB (24 Vdc supply); > 14 dB (12 Vdc supply)
  • Phantom Power Input24 Vdc @ 10 mA max.
  • Power RequirementGROUND-REFERENCED, 24 Vdc @ 25 mA
  • Dimensions (HxWxD)0.7" x 3" x 1.6"

In The Box

Videos Hide Videos Show Videos

Customer Reviews