Audio Monitor Panel, 12 Line or Speaker Inputs


Each RM-MP12 input may be individually calibrated for unbalanced consumer, balanced professional, 8 Ohm speaker line or constant voltage speaker lines. There is a variable intensity LED on the front panel to show audio presence for each input. If the RM-MP12 is set to the interlocking operating mode, front panel pushbuttons select one of the twelve inputs to feed the calibrated meter, front panel speaker (or external speaker if connected) and headphone jack.

In the mixing mode, the buttons allow the use to mix multiple sources. The front panel volume knob controls the audio level of the front panel headphone jack, front panel speaker, external speaker output and variable line level (+4 dBu) rear panel output. A separate fixed line level output is provided.

NOTE: Radio Design Labs' PS-24KS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.


  • Twelve Individually Selectable Audio Inputs
  • Front Panel Speaker and Headphone Jack
  • Front Panel VCA Control for Headphone and Speaker Output Levels
  • Internal 4.5 W RMS Power Amplifier and Speaker
  • Selectable Operating MODE Provides Interlocking Source Selection or Mixing Multiple Sources
  • LED Above Each Button to Show Selected Source
  • VU Ballistic LED Above the Button for Each Input
  • Calibrated Front Panel Meter Display
  • Audio Inputs and Outputs on Detachable Terminal Blocks


  • Inputs (12): +4 dBu, 25 V, 70.7 V, 100 V (set by rear-panel switches)
  • Input Level: -11 dBu to +9 dBu (+4 dBu input) 25 V, 70.7 V, 100 V (calibrated with gain trim set fully counter-clockwise)
  • Headroom: > 18 dB (above calibrated input level)
  • Gain: 0 dB to 20 dB (Adjustable for speaker-level input, 25-turn trim potentiometer) -5 dB to 15 dB (+4 dBu input)
  • Frequency Response: 10 Hz to 20 kHz (+/-0.25 dB)
  • THD+N: < 0.010% (20 Hz to 20 kHz)
  • Intermodulation Distortion: < 0.025% (20 Hz to 20 kHz)
  • Channel to Channel Crosstalk: < -80dB (10Hz to 20 kHz)
  • Residual Noise: < -80 dB (Channel ON; referred to +4 dBu)
  • OFF Attenuation: > 80 dB (10 Hz to 20 kHz)
  • Indicators per Channel (2): Red channel active LED above button; Variable intensity audio level LED for each input (minimum intensity at -15 dB, maximum intensity at 0 dB)
  • CMRR: > 75 dB (50 to 120 Hz)
  • Outputs (4):
    150 Ohms, +4 dBu fixed level (balanced or unbalanced via plug-in terminal block)
    150 Ohms, +4 dBu variable level (balanced, controlled by front-panel volume knob)
    4.5 W RMS external speaker connection (use of external speaker disconnects internal speaker) 100 mW ¼-inch stereo headphone jack
  • Power Requirement: GROUND-REFERENCED, 24 to 33 Vdc @ 700 mA
  • Mounting: Standard 19” Rack-mount; 1 Rack Unit (RU)
  • Dimensions: 1.75" H x 5.35" D (4.4 x 13.6 cm)
  • Ambient Operating Environment: 0° C to 55° C

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