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RDL STM-1 Microphone Preamplifier
RDL STM-1 Microphone Preamp

RDL STM-1 Microphone Preamp

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SoundPro Item: 77477
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  • RDL STM-1 Microphone Preamplifier
MSRP: $185.14
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The STM-1 is a low-cost quality microphone preamplifier designed for use in commercial sound and broadcast applications. The compact size makes it ideal where a larger or heavier preamp cannot be used. The high-performance circuit provides a fixed 50 dB gain to bring any mic-level signal up to the line-level range of nearly any line input. The STM-1 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. For intercom applications, the input will operate directly from a speaker.

RDL STM-1 Features

  • High or low impedance input mic preamp
  • Fixed 50 dB gain for consistency
  • Balanced or unbalanced output
  • Phantom capability
  • RF-filtered inputs and outputs
  • Excellent performance
  • STICK-ON® convenience
  • STM-1 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)
  • Gain50dB nominal
  • THD+N<0.05%
  • CMRR>50 dB (50 Hz to 20 kHz)
  • Residual Noise< -70 dB (below +4 dBu; 150 Ω source @ 50 dB gain)
  • 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

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