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Learn More About the RDL STM-2X

RDL STM-2X Switched Microphone Preamplifier - 35 to 65 dB Gain
    Questions? Ask a Markertek Expert:
    800-522-2025 Email

    RDL STM-2X Switched Microphone Preamplifier - 35 to 65 dB Gain

    Manufacturer: Radio Design Labs

    Item #: STM-2X   •   MFG #: STM-2X


    List Price:$224.17
    Our Price:$158.49

    free ship
    Availability: Usually ships in 3-10 business days
    This item is currently out of stock and will ship the minute we receive it – typically 3-10 business days. Need it sooner? Expedited delivery options may be available. Email [email protected] or call customer service at 800-522-2025 and we’ll make it happen.



      Required Accessories

      The RDL STM‑2X is the ideal choice in many installations where a microphone preamplifier is required, and is the ideal choice where either a toggle‑type switch or push‑to‑talk switch is to be provided for microphone control, particularly if condenser microphones are used.

      Required Power Supply RDL PS24V Sold Separately

      • Features

        • Quiet Switching of Condenser Microphone
        • Remote Microphone Soft‑Switching
        • Switch a Mic‑Level Source to a Mic or Line Level Output
        • Remote Toggle Switch or Push‑to‑Talk Button
        • Adjustable Preset Gain on Microphone Source
      • Specifications

        • Input: 500 Ω balanced; 5 kΩ unbalanced
        • Phantom: 24Vdc; IEC 1938: 1996‑12, Filtered
        • Outputs (2):
          - Line Level: +4 dBu 150Ω balanced
          - Mic Level: ‑45 dBu 150Ω balanced
        • Headroom: > 20 dB
        • Gain:
          - Line Level Output: Adjustable 35 to 65 dB
          - Mic Level Output: Adjustable ‑15 to 15 dB
        • Frequency Response: 50 Hz to 20 kHz (+/‑1 dB)
        • THD+N: < 0.05% (50 dB gain)
        • Residual Noise ON: < ‑70 dB (below to +4 dBu; 150 Ω source @ 50 dB gain)
        • OFF Attenuation:
          > 100 dB (1 kHz)
          > 80 dB (50 Hz to 20 kHz)
        • Switch Control Input: Connect to ground to activate signal; 0.5 mA maximum current required
        • Switching Time: < 5 ms (soft‑switching transition on or off)
        • CMRR: > 60 dB (50 Hz or 20 kHz)
        • Phantom Power Input: 24 to 33 Vdc @ 10 mA maximum
        • Power Requirement: GROUND‑REFERENCED, 24 to 33 Vdc @ 25 mA
        • Ambient Operating Environment: 0° C to 55° C

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