- Single-Speaker Monitor Amplifier
- Conferencing Monitor Amp
- Monitor Amp with Muting and Externally Actuated Attenuation Steps
- Fast, Silent Audio Switching
- Multiple Control Inputs
- Adjustable Gain
The ST-MA2 is a compact audio monitor amplifier with control inputs to mute or reduce the gain of its output. This module may be used in conjunction with other RDL® modules to configure automatic mixing systems or may be used alone as a single-speaker monitor amplifier. The ST-MA2 is typically used to drive a small tabletop or overhead monitor speaker in a conference room, boardroom, courtroom, public forum panel or similar installation. The ST-MA2 is ideally suited for use in automatic mixing systems due to its control inputs. The line-level input may be wired balanced or unbalanced. The audio output will drive standard speakers from 4 to 45 Ω. Normal gain is preset by means of a trimmer on the module. For tabletop installations, use the ST-MA2 with the WDG1 and RU-SP1. | Input Impedance: | 20 kΩ Balanced or Unbalanced Bridging | | Input Level: | -10 dBV minimum for 2 Watts RMS output | | Output Impedance: | 8 Ω (will drive 4 Ω loads) | | Output Power: | 1.75 Watts RMS Continuous; 2 Watts RMS max. | | THD+N: | < 0.5% | | Bandwidth: | 45 Hz to 14 kHz | | CMRR: | > 60 dB (50 Hz to 120 Hz) | | Residual Noise: | < -80 dB (below 2 Watts RMS) | | Switching Time: | < 50 us | | Attenuation (Muted): | > 90 dB (1 kHz),
> 85 dB (300 Hz to 3 kHz)
> 75 dB (20 Hz to 20 kHz) | | Selectable Attenuation: | 3 dB or 6 dB, each setting individually selectable using two independent inputs (connect to ground to activate) | | Power Requirement: | GROUND-REFERENCED, 24 to 33 Vdc @ 200 mA for rated output (220 mA @ 2 Watts RMS) | | Ambient Operating Environment: | 0° C to 50° C |
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