Audio Isolation Transformer-600 Ohm 1:1

The RDL TX-AT1 is a studio-quality bifilar audio transformer that provides galvanic isolation through 1:1 transformer coupling. It is designed to drive a 600-ohm audio line and uses terminal blocks for input and output connections. Its compact RDL TXs format measures 3.17 inches wide, 1.76 inches high, and 2.06 inches deep, making it suitable for installations where space, connection accessibility, and defined audio performance are important.

Ideal Use Cases

The TX-AT1 is suited to professional audio systems that require a transformer-coupled connection between source and destination equipment. Its 1:1 coupling makes it appropriate when the signal level should remain nominally unchanged while galvanic isolation is introduced. The transformer can drive a 600-ohm line, supporting integration with compatible professional audio equipment and distribution paths.

With a stated nominal input and output level of +4 dBu, the unit aligns with professional line-level applications. Its balanced-input CMRR specification also makes it relevant for systems where common-mode rejection at 50 to 60 Hz is an important performance consideration. The compact dimensions allow the transformer to be incorporated into equipment areas where a larger interface may be impractical.

Why Choose This Model

This model combines a studio-quality bifilar transformer with clearly specified audio performance. Frequency response is rated from 20 Hz to 20 kHz within +/- 0.1 dB, covering the stated audio band with tightly controlled response variation. Total harmonic distortion is less than 0.035% from 50 Hz to 20 kHz at a +4 dBu input. At 1 kHz and +4 dBu input, typical THD is specified at 0.001%.

The TX-AT1 also accommodates input and output levels up to +22 dBu maximum. These specifications make it possible to evaluate the transformer against known system requirements rather than relying on unspecified performance. Its terminal block connections provide a defined wiring interface for both sides of the transformer.

Installation and Integration

Input and output wiring is completed through terminal block connections. During integration, the source and destination should be connected to the appropriate transformer terminals while observing the requirements of the surrounding audio system. The 1:1 transformer coupling provides galvanic isolation between the connected sides, while the transformer is specified to drive a 600-ohm line.

The enclosure measures 3.17 inches (8.05 cm) wide, 1.76 inches (4.47 cm) high, and 2.06 inches (5.23 cm) deep. The specified ambient operating environment is 0 degrees C to 55 degrees C. These physical and environmental values should be considered when selecting the installation location. An engineering functional block CAD file and an American DXF front-panel diagram are listed among the available product resources.

Performance Highlights

• Studio-quality bifilar audio transformer.
• Galvanic isolation through 1:1 transformer coupling.
• Designed to drive a 600-ohm audio line.
• Frequency response of 20 Hz to 20 kHz within +/- 0.1 dB.
• THD below 0.035% from 50 Hz to 20 kHz at +4 dBu input.
• Typical THD of 0.001% at 1 kHz with +4 dBu input.
• Nominal input and output level of +4 dBu, with a +22 dBu maximum.
• CMRR greater than 85 dB with a balanced input from 50 to 60 Hz.
• Terminal block transformer connections.

What Makes It Different

The defining feature of the TX-AT1 is the combination of studio-quality bifilar construction, galvanic isolation, and 600-ohm line-driving capability in the RDL TXs format. Rather than presenting only a general-purpose transformer description, the available data specifies frequency response, distortion at multiple conditions, maximum signal level, and balanced-input common-mode rejection.

This collection of measurements provides a detailed basis for matching the TX-AT1 to an audio system. Its combination of terminal block connections and compact physical dimensions also distinguishes it as an integration-focused component rather than a connectorized desktop accessory.

Final Assessment

The RDL TX-AT1 is a focused solution for professional audio paths requiring 1:1 transformer coupling, galvanic isolation, and the ability to drive a 600-ohm line. Its 20 Hz to 20 kHz response, low stated distortion, +22 dBu maximum level, and greater-than-85 dB CMRR provide concrete performance criteria for system planning. For installations compatible with terminal block wiring and the RDL TXs form factor, it offers a compact, precisely specified transformer interface.