RDL ST-MX2 2 Channel Mic/Line I/O Mixer

MSRP: $240.46
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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):

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)

Mic: < 0.05% 25 to 20 kHz
Line: < 0.005%

< 0.004%

Output Level:
Mic: -45 dBu
line: +4 dBu

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)

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:

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:


RDL Three-Year Limited Warranty Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge, and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser. RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for RDL any other liability in connection with RDL products.