2 W Mono Audio Amplifier with Muting - 8 Ω

  • 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
  • Recommended Power Supply ( Not Included )
    PS-24AS (USA)PS-24AX (International)


    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, 0.3 mA)
    Ambient Operating Environment:0° C to 40° C
    Power Requirement:GROUND-REFERENCED, 24 Vdc @ 200 mA for rated output (220 mA @ 2 Watts RMS)
    Package Type:Cardboard Box
    WEEE weight:0.145 lbs.
    Shipping Weight:0.195 lbs.
    Tariff code:8543.70.9860
    Package Dimensions:2 x 2 x 4 in.

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