RDL Stereo Balanced to Unbalanced Signal Converter

The RDL TX-A2D converts a stereo balanced line-level signal into stereo unbalanced audio outputs. It accepts a nominal +4 dBu input and provides a nominal -10 dBV output through two gold-plated phono jacks. Studio-quality transformer isolation and passive operation make it a focused interface for connecting equipment that uses different line-level formats.

Ideal Use Cases

The TX-A2D is designed for systems in which a stereo balanced source must feed equipment with unbalanced phono inputs. It is particularly suitable when the source operates at a nominal +4 dBu level and the receiving equipment expects a nominal -10 dBV signal. The two-channel configuration preserves a stereo signal path from input to output.

Its detachable terminal-block input supports integration with installed balanced wiring, while the two phono output jacks provide direct connections to unbalanced audio equipment. The compact enclosure is also appropriate for installations where available equipment space is limited.

Why Choose This Model

This model combines balanced-to-unbalanced conversion, level conversion, and transformer isolation in one passive device. The nominal +4 dBu input is converted for a nominal -10 dBV output, addressing both connection format and operating-level differences between source and destination equipment.

The transformer-isolated design is identified by RDL as studio quality. Because the TX-A2D is passive, its specified conversion function does not depend on an active processing stage. The result is a purpose-built solution without controls or configuration settings that could complicate routine system integration.

Installation and Integration

Balanced stereo audio enters through a detachable terminal block. The converted left and right unbalanced signals are available through two gold-plated phono jacks. This connector arrangement allows the installed balanced wiring and the unbalanced output cables to remain distinct and accessible.

The TX-A2D measures 3.17 inches wide, 1.76 inches high, and 2.06 inches deep, equivalent to 8.05 by 4.47 by 5.23 centimeters. Its specified ambient operating range is 0 degrees C to 55 degrees C. Before installation, confirm that the balanced source remains within the stated maximum input level of +22 dBu and that the destination is intended for the converter’s nominal output level.

Performance Highlights

The line-level frequency response is specified from 20 Hz to 20 kHz within plus or minus 0.5 dB. Total harmonic distortion is less than 0.05 percent from 20 Hz to 20 kHz with a +4 dBu input, and less than 0.01 percent at 1 kHz.

Specified crosstalk is less than -80 dB from 20 Hz to 20 kHz, referenced to -10 dBV, and less than -90 dB at 1 kHz. These published figures provide concrete performance criteria for evaluating the converter in stereo line-level applications.

What Makes It Different

The TX-A2D is not simply a connector adapter. It performs stereo balanced-to-unbalanced conversion while translating the nominal operating level from +4 dBu to -10 dBV. Transformer isolation is incorporated into the signal path, and the output connections use two gold-plated phono jacks.

Its passive, dedicated design distinguishes it from products that combine conversion with unrelated switching, amplification, or processing functions. The detachable input connector also makes the unit practical for integration with terminated balanced wiring rather than requiring permanently attached input cables.

Final Assessment

The RDL TX-A2D is a compact stereo interface for converting a balanced +4 dBu line into unbalanced -10 dBV outputs. Its studio-quality transformer isolation, detachable terminal-block input, dual gold-plated phono outputs, 20 Hz to 20 kHz frequency response, and passive architecture address the essential requirements of this conversion task. For systems that need a straightforward connection between balanced stereo wiring and unbalanced phono inputs, it provides a clearly specified and installation-ready signal path.