Menu × Recording Live Sound Microphones DJ Lighting Installation Video Accessories Brands Specials
My Account Track Order Contact Us Services Events Blog Newsletter Apps

Toll Free: (800) 771-8330

Radio Design Labs ST-MX2 2 Channel Audio Mixer

  • Lifetime Tech Support
  • Best Seller!
  • Q & A
  • Product Highlights
  • 2 Input Audio Mixer
  • Mic or Line Level Inputs
  • Mic & Line Level Outputs
  • Add Inputs to a Mixer
  • Dual-LED VU Metering
  • Balanced or Unbalanced I/O
  • Low-Noise & Low-Distortion
Power Supply
Retail Price: $187.62 Instant Savings: -$51.21 You Pay: $136.41 QTY
  • Lifetime Tech Support
  • Best Seller!
  • Q & A
  • Product Highlights
  • 2 Input Audio Mixer
  • Mic or Line Level Inputs
  • Mic & Line Level Outputs
  • Add Inputs to a Mixer
  • Dual-LED VU Metering
  • Balanced or Unbalanced I/O
  • Low-Noise & Low-Distortion

2 Channel Audio Mixer - Microphone or Line Input and Output


The ST-MX2 is used in any application requiring mixing of two audio sources. A mic may be mixed with a line-level music source. Two mics may be mixed to feed the mic or line level input of a power amplifier. A mic or professional +4 dBu line-level mono sum is possible. It may be used to convert mono line-level signals from consumer to professional, or from professional to consumer format. It may also be used as a microphone preamplifier, or conversely to adapt unbalanced or balanced line-level signals into the microphone input of other equipment.


  • Two Input Audio Mixer
  • Selectable Mic or Line Level Inputs
  • Simultaneous Mic and Line Outputs
  • Add Additional Inputs to an Existing Mixer
  • Audio Output Dual-LED VU Metering
  • Balanced or Unbalanced Inputs and Outputs
  • Low-Noise and Low-Distortion Performance


  • Inputs (2): Selectable mic or line
  • Input Level for +4 dBu output:
    Mic: -45 dBu to -65 dBu; Max input -28 dBu
    Line: -18 dBV to +10 dBu; Max input +22 dBu
  • Input Impedance:
    Mic: 200 Ω
    Line: 20 kΩ bridging
  • Input or Output Configuration: Balanced or unbalanced
  • Outputs (2): MIC and LINE
  • Output Impedance: 150 Ω (mic or line)
  • Frequency Response:
    Mic: 25 Hz to 50 kHz (± 1 dB)
    Line: 10 Hz to 30 kHz (± 0.25 dB)
  • THD+N:
    Mic: < 0.05% 25 to 20 kHz
    Line: < 0.005%
  • IMD: < 0.004%
  • Output Level:
    Mic: -45 dBu
    Line: +4 dBu
  • Headroom:
    Mic Input: >22 dB (rel. -50 dBu), >32 dB (rel. -60 dBu)
    Line Input: >18 dB (rel. +4 dBu), Output: >20 dB (rel. +4 dBu)
  • Noise (below +4 dBu):
    Mic: <-70 dB (150 Ω source, 50 dB gain), <-80 dB (200 Ω source, 50 dB gain)
    Line: < -90 dB (reference +4 dBu, unity gain)
  • CMRR:
    Mic: > 65 dB (50 Hz to 120 Hz)
    Line: > 45 dB (50 Hz to 120 Hz)
  • Ambient Operating Environment: 0° C to 55° C
  • Power Requirement: GROUND-REFERENCED, 24 Vdc @ 60 mA
  • Dimensions: Height 0.7 in. (1.7 cm), Width: 3 in. (7.6 cm), Depth: 1.6 in (3.9 cm)
  • Package Type: Cardboard Box
  • Package Dimensions: 2 x 2 x 4 in.
  • Shipping Weight: 0.18 lbs.
  • WEEE weight: 0.125 lbs.
  • Tariff code: 8518.40.2000


Q & A

Radio Design Labs
MFR Part Number
Product Category
Install & Contracting Mixers
Unit of Measure
Shipping Weight
0.18 lbs.
Page Views
Previous Radio Design Labs product
Next Radio Design Labs product
Connect with Performance Audio
Sign up for our newsletter.
Click here to see our current newsletter >
Why Choose Performance Audio?
Light Bulb

40+ Years in the Business

Performance Audio isn't new to Pro Audio & Video. We have been servicing the needs of professionals for over 40 years! We have the expertise to help you get the job done right. The first time.


Real World Convenience

Performance Audio has built lasting relationships with the brands you love! We have decades of experience working with our suppliers. We are equipped to get you what you need, when you need it. When you need it.


Staff with Know-How

Performance Audio has long believed that experience and knowledge are vital to building relationships with our customers. We focus on getting, and keeping, a staff who know and love the Pro Audio & Video world. People like you.


Prices That Don't Suck

Performance Audio is one of the largest suppliers of professional audio & video gear in the Mountain West. We have one of the largest inventories in the industry. That means we can save you money! The right price.


Specials Shop by Brand Manufacturer Directory Request a Quote Get our iOS Apps
McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Performance Audio LLC BBB Business Review

Performance Audio Coupons on Ultimate Coupons
Performance Audio Apps on the iTunes App Store, Audio Tool, Decibel Meter Pro, Tone Generator Pro

© 2017 Performance Audio, LLC. All rights reserved.

All brand, company or product names contained may be trademarks or registered trademarks of their respective owners. Prices, specifications, and images are subject to change without notice. Not responsible for typographical or illustrative errors. All prices listed are in US dollars and do not include shipping and/or sales tax, when applicable.