- 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
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 single-ended supply input range is from 24 to 33 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. Each output drives high or low impedance loads. | 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 to 33 Vdc @ 10 mA maximum | | Power Requirement: | GROUND-REFERENCED, 24 to 33 Vdc @ 25 mA | | Ambient Operating Environment: | 0° C to 55° C |
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