Radio Design Labs TX-LC2
Active Audio Combiner/Balanced Line Converter


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List Price: $130.96
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Radio Design Labs' TX-LC2 is part of the group of versatile TX series products from Radio Design Labs. The TX series feature the advanced circuitry for which RDL products are known, combined with durable, quality connectors. The ultra-compact TX series can be mounted in limited space using the adhesive methods popularized by RDL's STICK-ON™ series. The TX-LC2 may be mounted directly to a backboard or chassis using a variety of mounting options available from RDL.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

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 output.

The input circuits are high-impedance, line-level (-10 dBV) and are each 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 Unity to 14 dB.

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 ohm balanced source to drive high or low impedance, balanced or unbalanced lines. The TX-LC2 may be operated from any power supply voltage between 24 Vdc and 33 Vdc, and as low as 12 Vdc with reduced headroom. The module's normal operating voltage is 24 Vdc.

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 Rack-Up®, STICK-ON, or TX series audio or video modules as part of a complete audio/video system.


  • To Mix 2 Unbalanced Audio Signals to Mono Balanced
  • To Combine Stereo Into Mono with Balanced Output
  • A Gain Trim For an Output
  • Isolation between Inputs
  • Unbalanced to Balanced Conversion
  • High Quality Audio
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Radio Design Labs' TX-RA5 chassis is a single rack unit accessory which provides mounting for up to 5 TX Series products.

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Kit to Mount ST, TX Series Modules on FP PanelRadio Design Labs MB3-RDL Kit to Mount ST, TX Series Modules on FP Panel

TX or STICK-ON Module fastens to MB-3 which slides into FP-RRA/H track.

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Two mounting brackets mounts a STICK-ON, TX, or Rack-Up module to a flat surface.

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Radio Design Labs' UC-1 is an ULTRASTYLE design tabletop chassis for mounting RDL modules and accessories. The front panel features a single RACK-UP mounting bay. The rear panel has an identical mounting bay and is supplied with matching ...

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Mounting Frame for Stick/TXRadio Design Labs SR-4 Mounting Frame for Stick/TX

Radio Design Labs' SR-4 is a universal module chassis that can mount to a backboard, wall or nearly any other support. It provides mounting for 4 STICK-ON power amplifiers or 7 standard STICK-ON modules. TX ™ modules may also be mounted. ...

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Our Price:$83.21List Price: $111.30You save 25%!

Pole Mount Tray for RDL Module Radio Design Labs PM-1T Pole Mount Tray for RDL Module

The PM-1T is a tray that mounts above a projector using a standard (1.5" I.D.) round projector pole or any smaller round or rectangular pole. The tray accommodates up to two FP-PA20 Audio Power Amplifiers (for stereo operation) and two ...

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Din Rail Adaptor for TX ModuleRadio Design Labs DRA-35T Din Rail Adaptor for TX Module

The DRA-35T provides mounting for any RDL® TX or MAX TX module to a DIN rail. The unique design allows mounting TX modules in a rack, cabinet or anywhere else DIN rail mounting of TX modules is desired.

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Mounting Kit for RU and TX SeriesRadio Design Labs MB2-RDL Mounting Kit for RU and TX Series

MB-2 pair mounts a RACK-UP or TX module above or below a surface.

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