RDL STM-3 High Gain Microphone Preamplifier

High Gain Microphone Preamplifier - 45 to 75 dB Gain 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.Features: 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 Specifications: Input: 500 Ω balanced; 5 kΩ unbalanced Phantom:24Vdc; IEC 1938: 1996-12, Filtered Output (2): +4 dBu 150 Ω balanced; -10 dBV unbalanced Frequency Response: 50 Hz to 25 kHz (+/- 1 dB) Gain: Adjustable 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 Ω source) Headroom: > 20 dB (24 Vdc supply); 14 dB (12 Vdc supply) Phantom Power Input:24 Vdc @ 10 mA maximum Power Requirement: GROUND-REFERENCED, 24 Vdc @ 25 mA Ambient Operating Environment:0 C to 55 C