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.
RDL STM-2 Features
- Low-noise mic preamp
- Adjustable output level
- High or low impedance mic inputs
- Mic input to 2 line outputs
- Two balanced or unbalanced outputs
- Phantom capability
- RF-filtered inputs
- STM-2 adjustable 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 35 to 65 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 @ 50 dB gain)
- Headroom> 20 dB (24 Vdc supply); > 14 dB (12 Vdc supply)
- Phantom Power Input24 to 33 Vdc @ 10 mA maximum
- Power RequirementGROUND-REFERENCED, 24 to 33 Vdc @ 25 mA
- Dimensions (HxWxD)0.7x3x1.6"
