MCM Electronics

Two Watts Muting Monitor Amplifier By Radio Design Labs (ST-MA2) MCM Part #555-18896

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2 W Mono Audio Amplifier with Muting - 8 O

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.

Specifications Top

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 O. 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.

  • 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

Input Impedance: 20 kO Balanced or Unbalanced Bridging
Input Level: -10 dBV minimum for 2 Watts RMS output
Output Impedance: 8 O (will drive 4 O 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 Vdc @ 200 mA for rated output (220 mA @ 2 Watts RMS)
Ambient Operating Environment: 0° C to 50° C

Part Numbers
MCM Part #:555-18896
Radio Design Labs Part #:ST-MA2
Package Specifications & Dimensions
Weight:0.1 lbs.
RoHS Comp:Yes
Warranty:1095 days
Need to Return?
Length:4 in.
Width:2 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

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