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.
RDL STM-3 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
- STM-3 high gain microphone preamplifier1
- Input500 Ω balanced; 5 kΩ unbalanced
- Phantom24 Vdc; IEC 61938: 2013, Filtered
- Outputs (2)+4 dBu 150 Ω balanced; -10 dBv unbalanced
- Frequency Response50 Hz to 30 kHz (± 1.5 dB)
- GainAdjustable 45 to 75 dB
- THD+N<0.05% (50dB gain)
- CMRR>50 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 Input24 Vdc @ 10 mA max.
- Power RequirementGROUND-REFERENCED, 24 Vdc @ 25 mA
- Dimensions (HxWxD)0.7" x 3" x 1.6"
