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 Ω balanced; 5 kΩ unbalanced
Phantom:24 Vdc; IEC 61938: 2013, Filtered
Output (2):+4 dBu 150 Ω 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 Ω 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.