Overview
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 ? balanced; 5 k? unbalanced |
| Phantom | 24 Vdc; IEC 61938: 2013, Filtered |
| Output (2) | +4 dBu 150 ? balanced; -10 dBV unbalanced |
| Frequency Response | 50 Hz to 30 kHz (± 1.5 dB) |
| Gain | Adjustable 45 to 75 dB |
| THD+N | < 0.05% (50 dB gain) |
| CMRR | > 50 dB (50 Hz to 20 kHz) |
| Residual Noise | < -70 dB (below +4 dBu, 150 ? source) |
| Headroom | > 20 dB (24 Vdc supply); 14 dB (12 Vdc supply) |
| Phantom Power Input | 24 Vdc @ 10 mA maximum |
| Ambient Operating Environment | 0° C to 55° C |
| Power Requirement | GROUND-REFERENCED, 24 Vdc @ 25 mA |
| Dimensions | Height: 0.7 in. (1.7 cm); Width: 3 in. (7.6 cm); Depth 1.6 in. (3.9 cm) |
| Package Type | Cardboard Box |
| Package Dimensions | 2 x 2 x 4 in. |
| Shipping Weight | 0.195 lbs. |
| WEEE weight | 0.145 lbs. |
| Tariff code | 8518.40.2000 |
