RDL ST-MX2 2-Channel Audio Mixer

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.

RDL ST-MX2 Features

• 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

• RDL ST-MX2 2-Channel Audio Mixer1

• 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: 200Ω
  • Line: 20 kΩ bridging
• Input or Output ConfigurationBalanced or unbalanced
• Outputs (2)MIC and LINE
• Output Impedance150Ω (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 (200Ω 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 Environment0°C to 55°C
• Power RequirementGROUND-REFERENCED, 24 Vdc @ 60 mA
• Dimensions (HxWxD)0.7x3x1.6" (1.7x7.6x3.9cm)
• Package TypeCardboard Box
• Package Dimensions2x2x4"
• Shipping Weight0.18 lbs
• WEEE Weight0.125 lbs
• Tariff Code8543.70.9860