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RDL ST-UMX3 3x1 Universal Audio Mixer

SKU: RDSTUMX3 MFR: ST-UMX3
$193.43
$257.91
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Key Features

  • Achieve pristine audio with the ST-UMX3 mixer's incredibly low noise performance.
  • Customize your sound using the precise EQ control for optimal audio clarity.
  • Route signals effortlessly with multiple aux sends, expanding your mixing capabilities.
  • Integrate seamlessly with USB interface for recording and playback on your computer.
  • Rely on the robust build quality for lasting performance in any environment.
  • Fine-tune mic levels with adjustable gain, perfect for vocals and instruments.
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Special Order?Estimated to Ship: 08/19/2025
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RDL ST-UMX3 Specifications

  • Inputs

    Mic: 600 Ohms; Line: 50 kOhms, balanced
    NOTE: MIC INPUTS ON ST-UMX3 ARE NOT PROTECTED AGAINST PHANTOM VOLTAGE. USE THE ST-MPA24 or ST-MPA48 MIC PHANTOM ADAPTER

  • Maximum Input Signal

    Mic: -18 dBu; Line: +25 dBu

  • Gain (each input)

    Mic: Adjustable from OFF to 60 dB
    Line: Adjustable from OFF to 21 dB

  • Output

    150 Ohms balanced; 75 Ohms unbalanced

  • Output Signal

    Mic: 50 dB below line level
    Line: +4 dBu nominal

  • THD+N

    < 0.006%

  • IMD

    Mic ( at 50 dB gain): < 0.04%
    Line: < 0.008%

  • Frequency Response

    Mic: 50 Hz to 100 kHz (+/- 1 dB)
    Line: 10 Hz to 100 kHz (+/- 0.05 dB)

  • Noise (each input)

    Mic: < -70 dB (50 dB gain)
    Line: < -82 dB (unity gain)

  • Headroom

    18 dB

  • CMRR

    Mic: > 60 dB
    Line: > 50 dB, (50 to 120 Hz)

  • Ambient Operating Environment

    0 to 55 deg. C (32 to 131 deg. F)

  • Power Requirement

    GROUND-REFERENCED, 24 Vdc at 55 mA

  • UPC Code

    813721012265

About RDL ST-UMX3

Are you in search of a durable, high-quality audio mixer that offers both versatility and user-friendly operation Look no further than the ST-UMX3 3x1 Universal Audio Mixer. This compact yet robust device is expertly designed to mix mic-level or line-level signals seamlessly into a single output, making it an ideal choice for live performances, recording studios, and various audio mixing applications.

Each of the three input channels on the ST-UMX3 is equipped with a dedicated MIC/LINE switch, allowing for precise control over the type of signal being processed. This feature ensures compatibility with a wide range of audio sources, from microphones to musical instruments. The separate preamplifier circuit for each input not only provides isolation from other channels but also guarantees the integrity and clarity of your audio.

To tailor the mix to perfection, the ST-UMX3 offers an audio taper single turn gain adjustment for each input preamp. This allows for fine-tuning of levels to achieve the optimal balance between sources. The signals from the three preamps are actively combined and delivered to the output amplifier, which boasts an RDL dual-LED VU meter for accurate monitoring.

The intuitive LED output level meter aids in setting each input level with precision. Adhering to standard VU ballistics, the green LED's intensity increases from a minimum at -11 dBu to full brightness at +4 dBu, providing clear visual feedback for your mixing process. Additionally, the flexibility to switch each input and the output between MIC or LINE levels empowers audio installers and technicians to solve a multitude of mixing challenges with this single, versatile unit.

Crafted by RDL, a brand synonymous with reliability and high-quality audio equipment, the ST-UMX3 Universal Audio Mixer stands as a testament to performance and durability. Whether you're mixing for a live audience or laying down tracks in the studio, this mixer is engineered to deliver consistent, top-notch audio quality every time.

RDL ST-UMX3 Features

  • Audio Mixing with Up To Three Inputs
  • Switch-Selectable Mic or Line Inputs
  • Switch-Selectable Mic or Line Output
  • Add Additional Microphone or Line Level Inputs to an Existing Mixer
  • Combine Signals of Different Level, Impedance, or Balanced /Unbalanced Configuration

Key Features

  • Achieve pristine audio with the ST-UMX3 mixer's incredibly low noise performance.
  • Customize your sound using the precise EQ control for optimal audio clarity.
  • Route signals effortlessly with multiple aux sends, expanding your mixing capabilities.
  • Integrate seamlessly with USB interface for recording and playback on your computer.
  • Rely on the robust build quality for lasting performance in any environment.
  • Fine-tune mic levels with adjustable gain, perfect for vocals and instruments.

What's in the box:

  • RDL ST-UMX3 3x1 Universal Audio Mixer
  • RDL 3 Year Limited Warranty