Lowell MP-1B
Passive Monitor Panel


Passive monitor panel Model MP-1B offers 12 x 1 selectable visual and aural monitoring. All twelve channels accept speaker level inputs (8 ohm or 0-70 volts) for monitoring amplifier outputs in large sound reinforcement systems. Visual monitoring with precise measurement of selected speaker input is accomplished using an analog meter with
VU and voltage scales. Subjective aural monitoring of selected speaker input is accomplished through the quality 3" x 5" internal speaker which may also be accessed using the monaural headphone output (stereo jack) on the front of the panel.

Model MP-1B front panel features an analog meter with VU and voltage scales, headphone jack and four control knobs for easy selection of monitored system inputs (1-6, Off, 7-12), individual speaker level inputs (1-6), individual speaker level inputs (7-12), and volume of selected input. Rear panel termination for input connections is made to barrier strip screw terminals which are group selectable for speaker level inputs 1-6 and 7-12 (70V, 25V or 10V for 8ohms). Rackmount chassis is sturdy steel construction finished in durable black powder epoxy. Overall size is 19”W x 3.5”H (2RU) x 5.5”D.


  • Provides visual and aural monitoring of up to 12 lines.
  • Inputs 1 - 6 accept speaker lines (70V, 25V or 8 ohm).
  • Inputs 7 - 12 accept speaker lines (70V, 25V or 8 ohm).
  • Quick visual reference with analog meter scales.
  • Versatile aural reference of selected line with 3” x 5” speaker and 1/4” headphone jack.



  • Headphone:  1/4" stereo jack for use with monaural headphones
  • Power:  Requires 117VAC 60Hz 18W max
  • Inputs:  12 barrier strip screw terminals for wire size 30-12AWG.


  • Dimensions:  19"W x 3.5"H (2RU) x 5.5"D
  • Weight:  6 lbs.
  • Exterior:  Steel with black powder coat and black poycarbonate overlay.


  • Input Impedances: Speaker (inputs 7-12):
    -  70V = 10K ohms
    -  25V = 1250 ohms
    -  10V = 240 ohms
  • Meter Scales
    -  70V:  0-100V
    -  25V:  0-35V
    -  10V:  0-14V (14V = 25W @ 8 ohms)
  • dB scale:  = to +3dB

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