4 Channel Audio Meter

  • Precision Audio Level Metering
  • Digital 16 LED String Display Indication
  • Four Mono Meters or Dual Stereo Metering
  • Line-Level, Speaker-Level or 25/70/100 V Audio Input
  • Selectable Fixed or Variable Calibration
  • Individual Channel Calibration Controls
  • Selectable Peak or Average Metering
  • Peak-Hold Display for +10, +14, +18 dB
  • Recommended Power Supply
    PS-24AS (USA)PS-24AX (International)


    The RU-SM16D is the ideal choice in most applications where the metering of multiple audio levels is to be designed into a system or added to existing equipment. The RU-SM16D has four separate inputs. Each input may be individually calibrated for unbalanced consumer, balanced professional, 8 Ohm speaker line or constant voltage speaker lines (25 V, 70 V or 100 V). All connections are made using detachable terminal blocks.

    A rear-panel switch selects variable or fixed calibration for 25V, 70V, 100V and +4 dBu sources. In the "variable" position, front-panel multi-turn trimmers adjust the calibrated meter levels.

    Rear-panel switches allow the installer to set each meter individually for either peak or average audio level display. In monaural installations, it may be advantageous to feed the mono source to two meters, setting one for peak and the other for average. In either mode the upper three LEDs (+10, +14, +18) remain in the PEAK HOLD mode. In stereo applications, each channel, left and right, can display both peak and average values. Each of the four meters in the RU-SM16D may be operated separately to monitor four different sources.

    The RU-SM16D uses bright LEDs for good visibility. Each input has a label area for identification of the source or function being metered.


    Power Requirement:GROUND-REFERENCED, 24 Vdc @ 450 mA
    Inputs (4):Line level or Amplified speaker level
    Input Impedance:> 40 kΩ balanced or unbalanced
    0 dB Calibration:Fixed or Variable (switch-selectable)
    Fixed Input Level:+4 dBu (+4 switch settings, for 0 dB reading)
    25 V* (25 V switch settings, for 0 dB reading)
    70 V* (70 V switch settings, for 0 dB reading)
    100 V* (100 V switch settings, for 0 dB reading)
    *Constant-voltage or low-impedance (4 Ohms, 8 Ohms) amplifier output
    Variable Input Level Range:-24 dBu to +12 dBu (+4 switch settings, for 0 dB reading)
    2 V to 90 V* (25 V switch settings, for 0 dB reading)
    4 V to 90 V* (70 V switch settings, for 0 dB reading)
    5 V to 100 V* (100 V switch settings, for 0 dB reading)
    *Constant-voltage or low-impedance (4 Ohms, 8 Ohms) amplifier output
    Metering Freq. Response:20 Hz to 20 kHz
    Indicators: 16 LEDs per channel:SIG, -20, -15, -12, -9, -6, -3, -2, -1, 0, +1.5, +3, +6, +10, +14, +18
    (+10, +14, +18 are PEAK HOLD indicators only)
    Metering Response:Each channel individually selectable PEAK or AVG (switch-selectable)

      Rise Time (10% to 90%):
      Rise Time (0% to 100%):
      Fall Time (90% to 10%):
      Fall Time (100% to 0%):
    Peak Mode Average Mode
    50 us          130 ms
    60 us          300 ms (VU Characteristic)
    65 ms         185 ms
    100 ms       300 ms (VU Characteristic)
    Ambient Operating Environment:0° C to 55° C
    Package Type:Cardboard Box
    Tariff code:9030.33.3800
    WEEE weight:1.09 lbs.
    Package Dimensions:6 x 6 x 2.625 in.
    Shipping Weight:1.325 lbs.

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    CAD FilesUnitsFormat
    Engineering Functional BlockAmericanDXF
    Panel Diagram - FrontAmericanDXF
    Panel Diagram - RearAmericanDXF
    Panel Diagram - FrontMetricDXF
    Panel Diagram - RearMetricDXF
    High Res ImagesFormat
    Declaration of Conformity


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