25% Off

RDL ST-MX3 3-Channel Line Input/Output Audio Mixer

SKU: RDSTMX3 MFR: ST-MX3
$179.62
$239.49
Save: $59.87 (25%)
Earn VIP Reward Points

Key Features

  • Achieve pristine sound quality with this low noise RDL 3-channel audio mixer.
  • Adjust input levels easily; ideal for balancing mics & line-level sources.
  • Use as a sub-mixer to expand your main mixing console's input capabilities.
  • Enjoy durable performance with a robust design, perfect for studio or field.
  • Optimize your audio with precise gain control on each of the three input channels.
  • Integrate seamlessly; this mixer is great for broadcast, podcast, or installed sound.
See More Product Details
Special Order?Estimated to Ship: 09/09/2025
Calculate Shipping

See Options

1

Protect your gear with Adorama Protect.* Learn more

1 Year

$15.99

2 Year

$23.99

3 Year

$35.99

Available to U.S. customers only.

Need help? Ask our experts.

Overview
Compare
Specs
Protection
Q&A

Questions & Answers

Reviews about this item

Review Summary

Select a plan in the Add Protection section above and purchase with this product by clicking “Add to Cart”.

image-protection

TRUSTED PROTECTION PLANS, EXCEPTIONAL SERVICE.

Invest In Your Gear and Peace Of Mind!

Accidents happen. Protect your favorite Adorama products and purchase a protection plan to stay covered from accidental damage, mechanical or electrical failures, and more.

Repair or Replacement

Repair or Replacement

If we can’t fix it, we’ll replace it at no additional cost.

Accidental Damage

Accidental Damage

Protect your product from drops, spills, and more.

Peace of Mind

Peace of Mind

Enjoy your gear without fear. We have you covered!

Failure Protection

Failure Protection

When regular use of your product over time results in mechanical or electrical failure.

Zero Deductible

Zero Deductible

We will never charge you a deductible after the purchase of a plan.

Customer-Focused Support

Customer-Focused Support

Our claims process is simple & easy and our customer service team is happy to help.

Adorama Protect powered by Extend is available for purchase to customers in the United States. Not available for international or U.S. territories purchases. Plans on open box items do not cover pre-existing damage.
Adorama Protect plans are available for ABS clients. If you have any questions or require assistanse, please call 800-223-2500

RDL ST-MX3 Specifications

  • Inputs (3)

    30 kOhms balanced or unbalanced bridging

  • Input Level

    -20 dBu to +18 dBu (for +4 dBu output)
    -24 dBu to +14 dBu (for 0 dBu output)

  • Output

    400 Ohms to drive low or high impedance balanced or unbalanced lines

  • Output Level

    +4 dBu nominal, (adjustable; unbalanced output 6 dB below balanced line level)

  • THD+N

    < 0.03% (10 Hz to 20 kHz)

  • Frequency Response

    10 Hz to 20 kHz (+/- 0.5 dB)

  • Noise

    < -80 dB (all inputs at 10 dB gain, referenced to +4 dBu)

  • Headroom

    18 dB

  • Gain (each input)

    -14 dB to +24 dB (adjustable)

  • CMRR

    > 50 dB (50 to 120 Hz)

  • Ambient Operating Environment

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

  • Power Requirement

    GROUND-REFERENCED or FLOATING, 24 Vdc at 55 mA

  • Dimensions

    3.0 x 1.6 x 0.7" (7.62 x 4.06 x 1.78cm)

  • UPC Code

    813721011015

About RDL ST-MX3

Under the banner of RDL's esteemed STICK-ON Series, the ST-MX3 3-Channel Line Input/Output Audio Mixer emerges as a paragon of audio precision and versatility. Designed for the discerning audiophile, this high-quality mixer module facilitates the seamless blending of three line-level inputs, each with dedicated gain adjustments to ensure meticulous control over your sound.

Crafted with durability in mind, the ST-MX3 is engineered to withstand the rigors of both studio and live performance environments. Its professional-grade construction guarantees a reliable mixing experience, while the intuitive design makes it a user-friendly choice for audio enthusiasts of all skill levels.

The output of this versatile mixer is adept at driving a wide array of loads, whether they are high or low impedance, balanced or unbalanced, ensuring compatibility with a diverse range of audio equipment. The ST-MX3's operational flexibility is further enhanced by its ability to run from ground-referenced floating or bipolar DC power, making it a go-to solution for various audio mixing scenarios.

In addition to its core mixing capabilities, the ST-MX3 boasts a master output level control and a headphone output, offering additional layers of auditory management. This feature set positions the ST-MX3 as an indispensable tool for musicians, DJs, and audio professionals who demand a robust, high-fidelity audio mixing solution.

Choose the ST-MX3 for its blend of RDL's reputable brand excellence and the practicality of a 3-channel mixer. Whether you're orchestrating a live performance, managing a recording session, or crafting the perfect soundscape, the ST-MX3 stands ready to elevate your audio mixing to professional heights.

RDL ST-MX3 Features

  • Mix Line-Level Signals
  • Three Individually Adjustable Inputs
  • Add Additional Line Level Inputs to an Existing Mixer
  • Combine Signals of Different Level, Impedance or Balanced /Unbalanced Configuration
  • Isolation Between Input Signals
  • Low-Noise and Low-Distortion Performance
  • RDL SupplyFlex Power Input Configuration

Product Documents

User Manual

Key Features

  • Achieve pristine sound quality with this low noise RDL 3-channel audio mixer.
  • Adjust input levels easily; ideal for balancing mics & line-level sources.
  • Use as a sub-mixer to expand your main mixing console's input capabilities.
  • Enjoy durable performance with a robust design, perfect for studio or field.
  • Optimize your audio with precise gain control on each of the three input channels.
  • Integrate seamlessly; this mixer is great for broadcast, podcast, or installed sound.

What's in the box:

  • RDL ST-MX3 3-Channel Line Input/Output Audio Mixer
  • RDL 3 Year Limited Warranty