The STM-2 is a quality low-noise microphone preamplifier 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 lownoise performance make it the best choice, even when larger preamps could be used. 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.
| Input | 500 Ω balanced; 5 kΩ unbalanced |
|---|---|
| Phantom | 24Vdc; IEC 1938: 1996‑12, Filtered |
| Outputs (2) | +4 dBu 150 Ω balanced; ‑10dBv unbalanced |
| Frequency Response | 50 Hz to 20 kHz (+/‑ 1.5 dB) |
| Gain | Adjustable 35 to 65 dB |
| THD+N | < 0.05% (50 dB Gain) |
| CMRR | > 60 dB (50 Hz to 30 kHz) |
| Residual Noise | < ‑70 dB (below +4 dBu 150 Ω source @ 50 dB gain) |
| Headroom | > 20 dB (24 Vdc supply);> 14 dB (12 Vdc supply) |
| Power Requirement | Ground‑Referenced, 24 to 33 Vdc @ 25 mA |
| Ambient Operating Environment | 0° C to 55° C |
| Dimensions (H x W x D) | 0.7" (17.78 mm) x 3" (76.2 mm) x 1.6" (40.64 mm) |
| Weight | 0.145 lbs (0.66 kg) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
