DESCRIPTIONS

Radio Design Labs STM-2X Switched Microphone Preamplifier - 35 to 65 dB gainFeatures: Quiet Switching of Condenser Microphone; Remote Microphone Soft-Switching; Switch a Mic-Level Source to a Mic or Line Level Output; Remote Toggle Switch or Push-to-Talk Button; Adjustable Preset Gain on Microphone Source; The STM-2X is the ideal choice in many installations where a microphone preamplifier is required, and is the ideal choice where either a toggle-type switch or push-to-talk switch is to be provided for microphone control, particularly if condenser microphones are used. Input: 500 Ω balanced; 5 kΩ unbalanced; Phantom: 24 Vdc; IEC 61938: 2013, Filtered; Outputs (2): Line Level: +4 dBu 150Ω balanced / Mic Level: -45 dBu 150Ω balanced; Headroom: 20 dB; Gain: Line: Adjustable 35 to 65 dB; Mic Level Output: Adjustable -15 to 15 dB; Frequency Response: 50 Hz to 30 kHz (± 1.5 dB); THD+N: <0.05% (50 dB gain); Residual Noise ON: <-70 dB (below to +4 dBu; 150 Ω source @ 50 dB gain); OFF Attenuation: 100 dB (1 kHz) 80 dB (50 Hz to 20 kHz); Switch Control Input: Connect to ground to activate signal; 0.5 mA maximum current required; Switching Time: <5 ms (soft-switching transition on or off); CMRR: 50 dB (50 Hz to 20 kHz); 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;