Radio Design Labs STM-LDA3
Ultra Low-Noise Microphone Preamplifier

OUR PART #  STMLDA3


Radio Design Labs' STM-LDA3 is designed for use in quality commercial sound, broadcast and recording applications. The 1.2 kohm balanced input accepts a wide variety of microphone input levels without loading professional low-impedance microphones. A multi-turn gain trimmer allows precise output level adjustment. The output signal is available on three separate balanced line level outputs. Each output may be connected balanced or unbalanced.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

RDL's exclusive low-noise discrete preamplifier circuitry produces studio-quality low-noise performance in an economical preamplifier. Dynamic or condenser microphones may be used with the STM-LDA3. Standard 24V phantom is supplied to the input when the supply voltage is connected to the PHM terminal. Optimum operating level is set using RDL's unique dual-LED VU meter, located adjacent to the terminal block. A green LED illuminates at 15 dB below a +4 dBu output. The intensity of the green LED progresses from minimum to full intensity at +4 dBu. The adjacent red LED illuminates when the operating level exceeds +4. This makes the STM-LDA3 easy to set up without any external test equipment, and operating levels may be monitored at the module.

Features:

  • Studio-Quality Microphone Preamplification
  • Three Distributed Line-Level Outputs
  • Low-Noise and Low-Distortion Performance
  • Selectable Filtered Phantom Voltage
  • Adjustable Gain up to 60 dB
  • RDL's® Exclusive Dual-LED VU Metering
  • Versatility of STICK-ON® Compactness

Specifications:

  • Input: 1.2 kO balanced
  • Outputs (3): +4 dBu, 150 ohm balanced
  • Gain: 40 to 60 dB (25 turn adjustable)
  • Frequency Response: 30 Hz to 20 kHz (+/- 0.2 dB)
  • THD+N: < 0.1%
  • IMD: < 0.1%
  • Noise: < -70 dB (below +4 dBu @ 60 dB gain -wideband);  < -80 dB (below +4 dBu @ 50 dB gain - wideband)
  • Equivalent Input Noise: < -130 dB (gain + residualnoise below +4 dBu)
  • Headroom: > 20 dB (above +4 dBu)
  • Headroom: > 20 dB (above +4 dBu)
  • CMRR: > 60 dB (100 Hz to 5 kHz)
  • Power Requirement: GROUND-REFERENCED, 24 to 33 Vdc @ 40 mA
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