Professional 4 Channel Microphone/Line Mixer with Phantom Power - Microphone and line output

  • Four Channel Audio Mixer with Expansion Capability
  • XLR Microphone Inputs, Phono Jack Line Inputs
  • Switchable 24 V Phantom for Each Mic Input
  • Mic or Line XLR Output, Switchable
  • Unbalanced Line Output and Direct Input
  • Integral Compressor/Limiter, Switchable
  • Studio-Quality, Low-Noise Performance
  • Recommended Power Supply ( Not Included )
    PS-24AS (USA)PS-24AX (International)


    The RU-MX4 is the ideal choice in many applications where a combination of balanced mic and/or unbalanced line-level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four inputs can accept either a balanced XLR mic or an unbalanced line-level input. 24 V phantom is individually switch selectable for each mic input. The unbalanced phono jack LINE OUTPUT from one RU-MX4 may connect to the unbalanced input of other equipment, or may be connected to the DIRECT input of another RU-MX4 to expand mixing capabilities. The RU-MX4 provides one balanced output, switchable for mic or line level. Audio levels are adjustable on the front panel. Each input channel is equipped with a front-panel dual-LED VU meter that follows standard VU ballistics. The final mix is displayed on an LED string VU meter featuring a visually comfortable arc motion. A rear-panel switch allows the soft-knee compressor to be switched in or out. A factory installed output isolation transformer is available by ordering the RU-MX4T.


    Microphone Inputs (4):2 kΩ balanced, switchable 24 V phantom (IEC 61938: 2013)
    Mic Input Level for +4 dBu output:-58 to −20 dBu (PHANTOM OFF or ONHI gain); -41 to −4 dBu (PHANTOM ON LO gain)
    Line Inputs (4):2 kΩ unbalanced
    Line Input Level for +4 dBu out:-25 dBV to +20 dBV, -10 dBV nominal
    Gain Adjustments (5):Mic: Off to 62 dB gain (PHANTOM OFF ONHI gain);
    Off to 46 dB gain (PHANTOM ON LO gain);
    Line: Off to 27 dB gain
    Output Attenuator:0 dB to infinity
    Frequency Response:Mic: 80 Hz to 30 kHz (± 1.5 dB),
    <-10 dB @ 20 Hz (integral high-pass filter)
    Line: 20 Hz to 30 kHz (± 0.25 dB)
    THD+N:Mic: < 0.1% (80 Hz to 20 kHz)
    Line: < 0.02%

    Residual Noise (wideband, below +4 dBu output):
    Unity Gain:< -84 dB (4 Line level sources)
    40dB Gain, Phantom on:Mic: -79 dB; < -73 dB (All 4 mic level sources)
    50dB Gain:Mic: -79 dB; < -73 dB (All 4 mic level sources)
    60dB Gain:Mic: -70 dB; < -64 dB (All 4 mic level sources)
    Outputs (2):+4 dBu 150 Ω bal. (switchable to MIC level -45 dBu);
    -10 dBV unbalanced
    Indicators (18):Dual-LED VU meter for each input;
    COMP/LIMIT active LED; POWER LED; LED audio mix meter,
    0 dB = +4 dBu
    VU (dB): -20, -10, -6, -2, 0, +3; Peak Reading (dB): +8,+12
    Ambient Operating Environment:0° C to 50° C
    Power Requirement:GROUND-REFERENCED, 24 Vdc @ 150 mA
    Package Type:Cardboard Box
    WEEE weight:1.38 lbs.
    Shipping Weight:1.63 lbs.
    Tariff code:8543.70.9860
    Package Dimensions:6 x 6 x 2.625 in.

    Related Products

    • EZ-MX4L

      Stereo Line-Level Audio Mixer - 4X1

    • EZ-MX4ML

      Mic and Stereo Line Audio Mixer - 4X1

    • FP-MX3R

      Remote Controlled Line-Level Mixer

    • FP-MX4

      4 Channel Audio Mixer - Microphone or line input and output

    • RU-MX4L

      Professional 4 Channel Line Level Mixer - Microphone and line Output

    • RU-MX4LT

      Professional 4 Channel Line Level Mixer with Transformer - Microphone and line output

    • 4 Channel Mixer


      Professional 4 Channel Microphone/Line Mixer with Phantom Power & Transformer - Microphone and line output

    • Five Channel Mixer


      5 Channel Mic/Line Audio Mixer with Phantom Power

    • Two Channel Audio Mixer


      2 Channel Audio Mixer - Microphone or line input and output

    • ST-MX3

      3 Channel Audio Mixer - Line input and output

    • Compact 3x1 Audio Mixer


      3x1 Universal Audio Mixer - 3 microphone or line inputs x 1 microphone or line output

    • TX-MX2R

      Audio Mixer / Distribution Amplifier

    Format-A® Mixers
    • FP-TPX3A

      Format-A Twisted Pair Remote Controlled Mixer

    Related Products

    Rack-Up® Mounting Accessories
    • RU-BR1

      Mounting Bracket for RACK-UP Series

    • RU-HRA1

      10.4" Rack Mount for 1 RACK-UP Series Product

    • RU-RA3R

      Rack adapter for RACK-UP series

    • RU-SMA1

      RACK-UP Mounting Plate - Mounts any RACK-UP module in a cabinet or other flat surface

    • UC-1R

      RACK-UP Enclosure

    • UC-2R

      Double Wide RACK-UP Enclosure

    • WDG1R

      Table Top "Wedge" Chassis

    General Wiring Accessories
    • RC-1UR

      19" Universal Rack Chassis

    DIN Rail Mounting Accessories




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


    How To Buy

    Direct Dealer Program

    Becoming an RDL direct dealer is quick and easy. To become a direct dealer, your company must meet the following requirements:

    • Must be an A/V contractor, sound contractor or system integrator
    • Must possess a current resale certificate for your state
    Click here to submit a new direct dealer account inquiry

    Buy Online