MCM Electronics

RDL Microphone Preamplifier By Radio Design Labs (STM-2) MCM Part #555-STM-2

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Microphone Preamplifier

The STM-2 is a low-noise microphone preamp 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.

Specifications Top

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.

  • 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

Input: 500 ohm balanced; 5 Kohm unbalanced
Phantom: 24 VDC; IEC 61938: 2013, Filtered
Outputs (2): +4 dBu 150 ohm balanced; -10 dBv unbalanced
Frequency Response: 50 Hz to 30 kHz (± 1.5 dB)
Gain: Adjustable 35 to 65 dB
THD+N: < 0.05% (50 dB Gain)
CMRR: >50 dB (50 Hz to 20 kHz)
Residual Noise: < -70 dB (below +4 dBu 150 ohm source @ 50 dB gain)
Headroom: > 20 dB (24 VDC supply);
> 14 dB (12 VDC supply)
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
Dimensions: Height: 0.7 in. (1.7 cm), Width: 3 in. (7.6 cm), Depth: 1.6 in. (3.9 cm)
Package Dimensions: 2" x 2" x 4"
Shipping Weight: 0.195 lbs.

Part Numbers
MCM Part #:555-STM-2
Radio Design Labs Part #:STM-2
Package Specifications & Dimensions
Weight:0.23 lbs.
Warranty:1095 days
Need to Return?
Length:4.25 in.
Width:2.25 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
MCM Cat 57, Page 149
MCM Cat 56, Page 164
View in Catalog

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