Overview
The STM-1 is a low-cost quality microphone preamplifier designed for use in commercial sound and broadcast applications. The compact size makes it ideal where a larger or heavier preamp cannot be used. The high-performance circuit provides a fixed 50 dB gain to bring any mic-level signal up to the line-level range of nearly any line input. The STM-1 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. For intercom applications, the input will operate directly from a speaker.
Features
- High or Low Impedance Input Mic Preamp
- Fixed 50 dB Gain for Consistency
- Balanced or Unbalanced Output
- Phantom Capability
- RF-Filtered Inputs and Outputs
- Excellent Performance
- STICK-ON® Convenience
Specifications
| Input | 500 ? balanced; 5 k? unbalanced |
| Phantom | 24 Vdc; IEC 61938: 2013, Filtered |
| Outputs (2) | +4 dBu 150 ? balanced; -10 dBv unbalanced |
| Frequency Response | 50 Hz to 30 kHz (± 1.5 dB) |
| Gain | 50 dB nominal |
| THD+N | < 0.05% |
| CMRR | >50 dB (50 Hz to 20 kHz) |
| Residual Noise | < -70 dB (below +4 dBu; 150 ? source @ 50 dB gain) |
| 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 |
| 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 |
