RDL®

STICK-ON Mic Preamps – Which One do I need?

RDL STM-1, STM-2 and STM-3 Microphone Preamplifiers all seem to look alike and indeed they do have some similarities:

GENERAL

  • Identical noise, distortion, frequency response, headroom and common mode rejection specifications.
  • Identical power requirements. 24 vdc @ 25 mA or 12 vdc with a 6 dB reduction in headroom.

INPUT

  • Balanced or unbalanced
  • Balanced input accepts dynamic or condenser microphones with impedances from 150 to 600 ohms.
  • Unbalanced input impedance of 5 k Ohms or dynamic HI-Z mics.
  • Allows the use of 4 or 8 ohm loudspeakers to be used as a microphone in monitoring and intercom applications.
  • Selectable 24 volt phantom power for condenser microphones.

Outputs

  • Balanced +4 dBu, unbalanced -10 dBv

So here are the Differences:

stm-1STM-1

  • Fixed gain of 50 dB
  • 1 unbalanced output
  • 1 balanced output which can be configured unbalanced
  • Used in applications where the mixer or amplifier being fed has plenty of gain adjustment

stm-2STM-2

  • Adjustable gain of 35 – 65 dB
  • 2 balanced outputs either or both of which can be configured unbalanced
  • Used in applications where the microphone has normal to high output sensitivity

stm-3STM-3

  • Adjustable gain of 45 – 75 dB
  • 2 balanced outputs either or both of which can be configured unbalanced
  • Used in applications where the microphone has low to normal output sensitivity or where higher levels are required
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