Unbalanced to Balanced Line Combiner

  • Mix 2 Unbalanced Audio Signals to Mono Balanced
  • Combine Stereo Into Mono with Balanced Output
  • Output Gain Trim
  • Isolation Between Inputs
  • Unbalanced to Balanced Conversion
  • High-Quality Audio
  • Recommended Power Supply ( Not Included )
    PS-24AS (USA)PS-24AX (International)


    The TX-LC2 is the ideal choice in installations requiring the active, isolated mixing of two unbalanced line-level audio sources to feed a balanced (or unbalanced) audio line.

    The input circuits are high-impedance, line-level (-10 dBV) and are isolated from each other. Therefore the modules may be used to bridge an unbalanced stereo source without affecting the stereo separation. The output from the TX-LC2 is a mono mix of the stereo signal. Gain of the combined signals is adjustable from -10 to +10 dB (rel. +4 dBu output).

    The TX-LC2 may also be used to mix two separate sources into a single output. The mixing circuit in the module is an active summing amplifier.

    The output driver provides a 150 Ω balanced source to drive high or low impedance, balanced or unbalanced lines. The TX-LC2 is operated from a 24 Vdc power supply, and with reduced headroom it may be operated from a 12 Vdc power supply.

    The input connectors make connection of the TX-LC2 easy. The broad gain range makes the TX-LC2 ideally suited to any installation where a balanced mono signal is needed from a stereo unbalanced source, particularly low-output consumer products such as certain televisions.

    Use the TX-LC2 individually, or combine it with other RDL modules and accessories as part of a complete audio/video system.


    Dimensions:Height: 1.4 in. 3.6 cm; Length: 3.0 in. 7.6 cm; Width: 1.2 in 3.0 cm
    Inputs (2):-10 dBV nominal, -22 dBV minimum
    Input Impedance:10 kΩ
    Noise:< -85dB below +4 dBu (-10 dBV input @ 12 dB gain)
    THD+N:< 0.005%
    Frequency Response:10 Hz to 20 kHz (± 0.25 dB into bridging input)
    25 Hz to 20 kHz (± 0.25 dB into 600 Ω)
    Gain:±10 dB (rel. +4 dBu balanced output, adjustable)
    IMD:> 0.001%
    Output:150 Ω balanced, +4 dBu to drive low or high impedance, balanced or unbalanced lines
    Headroom:> 18 dB
    Ambient Operating Environment:0° C to 55° C
    Power Requirement:GROUND-REFERENCED, 24 Vdc @ 30 mA
    Package Type:Cardboard Box
    WEEE weight:0.195 lbs.
    Shipping Weight:0.255 lbs.
    Tariff code:8543.70.9860
    Package Dimensions:2 x 2 x 4 in.

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      Unbalanced Input Transformer - Unbalanced stereo inputs to summed balanced mono output

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    CAD FilesUnitsFormat
    Engineering Functional BlockAmericanDXF
    Panel Diagram - FrontAmericanDXF
    Panel Diagram - FrontMetricDXF
    High Res ImagesFormat
    Declaration of Conformity

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