RDL STM-3 High Gain Mic Preamp


Please Note: requires PS-24AS Power Supply (sold separately)

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Dale #:RDL-STM3

Availability: In Stock

Available for immediate shipment and pick-up from our Jamaica, New York location. In-store pick-up is available Monday through Friday from 8:30 am to 5:30 pm
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  • 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.


    • 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
  • Input500 O balanced; 5 kO unbalanced
    Phantom24Vdc; IEC 1938: 1996-12, Filtered
    Output (2)+4 dBu 150 O balanced; -10 dBV unbalanced
    Frequency Response50 Hz to 25 kHz (+/- 1 dB)
    GainAdjustable 45 to 75 dB
    THD+N< 0.05% (50 dB gain)
    CMRR> 60 dB (50 Hz to 20 kHz)
    Residual Noise< -70 dB (below +4 dBu, 150 O source)
    Headroom> 20 dB (24 Vdc supply); 14 dB (12 Vdc supply)
    Phantom Power Input24 Vdc @ 10 mA maximum
    Power RequirementGROUND-REFERENCED, 24 Vdc @ 25 mA
    Ambient Operating Environment0° C to 55° C
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