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Learn More About the RDL STM-2

RDL STM-2 Adjustable Gain Microphone Preamplifier - 35 to 65 dB Gain
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    RDL STM-2 Adjustable Gain Microphone Preamplifier - 35 to 65 dB Gain

    Manufacturer: Radio Design Labs

    Item #: STM-2   •   MFG #: STM-2


    List Price:$197.92
    Our Price:$139.95

    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 – normally 3-10 business days. Need it sooner? Call 800-522-2025 and we'll make it happen,or email Customer Service for expedited delivery options. Certain Non-Stock Items Valued over $50.00 may Ship FREE UPS GROUND in the Continental US. Multiple quantities of the same non-Stock Item Valued below $50.00 may be ordered to meet the $50 minimum order requirement to qualify for Free UPS Ground Freight. This offer does not apply to certain freight-intensive or hazardous items. Certain restrictions may apply.



      Required Accessories

      The RDL STM‑2 is a quality low‑noise microphone preamplifier designed for use in commercial sound, broadcast, and recording. The STM‑2 is very flexible, with gain adjustment from 35 to 65 dB, two balanced or unbalanced outputs, and available phantom supply input. Its ultra‑low distortion and low noise performance make it the best choice, even when larger preamps could be used.

      The STM 2 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.

      Required Power Supply RDL PS24V Sold Separately

      • Features

        • Low‑Noise Mic Preamp
        • Adjustable Output Level
        • High or Low Impedance Mic Inputs
        • Mic Input to 2 Line Outputs
        • Two Balanced or Unbalanced Outputs
        • Phantom Capability
        • RF‑Filtered Inputs
      • Specifications

        • Input: 500 Ω balanced; 5 kΩ unbalanced
        • Phantom: 24Vdc; IEC 1938: 1996‑12, Filtered
        • Outputs (2): +4 dBu 150 Ω balanced; ‑10dBv unbalanced
        • Frequency Response: 50 Hz to 20 kHz (+/‑ 1.5 dB)
        • Gain: Adjustable 35 to 65 dB
        • THD+N: < 0.05% (50 dB Gain)
        • CMRR: > 60 dB (50 Hz to 30 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)
        • Power Requirement: GROUND‑REFERENCED, 24 Vdc @ 25 mA
        • Ambient Operating Environment: 0° C to 55° C

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