Consumer Input Jacks-Stereo-Black

The RDL DB-CIJ3D is a black stereo consumer-input interface that brings common unbalanced line-level sources into a balanced stereo audio path. Its three input connectors consist of left and right phono/RCA jacks with gold contacts and one 3.5 mm stereo mini-jack. Transformer isolation provides unbalanced-to-balanced conversion without gain and supports hum cancellation on the incoming unbalanced lines. The stereo output is presented on a detachable terminal block for connection to equipment with 10 kΩ inputs.

Ideal Use Cases

The DB-CIJ3D fits audio systems in which a stereo source provides line-level audio through paired RCA connectors or a 3.5 mm stereo connector, while the connected equipment requires a balanced stereo feed. It is particularly applicable when hum on unbalanced line inputs is a concern and transformer isolation is required. Because the interface performs conversion without adding gain, it is intended for signal paths that need connection-format conversion and isolation rather than level amplification. Its line-level output is specified for feeding 10 kΩ equipment inputs.

Why Choose This Model

This model accommodates two widely used stereo connection formats within one black interface. The paired phono jacks provide dedicated left and right inputs and use gold contacts. The 3.5 mm mini-jack accepts stereo through a single connector. On the output side, the detachable terminal block provides the documented connection point for the balanced stereo output. Together, these features address the transition from consumer-style unbalanced line connections to balanced system wiring while retaining the original signal level without added gain.

Installation and Integration

The DB-CIJ3D measures 4.13 inches high by 1.7 inches wide by 2.15 inches deep, equivalent to 10.49 by 4.32 by 5.47 centimeters. The specified minimum mounting-box dimensions are 1.80 inches wide by 1.75 inches deep, or 4.57 by 4.45 centimeters. Installers can connect the downstream equipment through the detachable terminal block and select the appropriate input connection for the source: left and right RCA/phono jacks or the stereo 3.5 mm mini-jack. The specified ambient operating range is 0°C to 55°C. Front and rear panel diagrams and engineering functional-block CAD files are identified as available in American DXF format, while the specification sheet is provided as a PDF.

Performance Highlights

At line level, the DB-CIJ3D has a stated frequency response of 50 Hz to 20 kHz within ±1 dB. Its wider stated response is 30 Hz to 20 kHz within ±2 dB. Transformer isolation is used for the unbalanced line inputs, supporting hum cancellation and conversion to a balanced output. The conversion stage operates without gain, so the model does not serve as an input-level booster. Its stereo line-level output is designed to feed equipment inputs with a 10 kΩ impedance through the detachable terminal-block connection.

What Makes It Different

The defining combination is stereo source connectivity, transformer isolation, hum cancellation, and unbalanced-to-balanced conversion in one black model. Users can connect either paired left/right RCA-style phono plugs or a 3.5 mm stereo plug without requiring the same connector format from every source. The absence of added gain clearly establishes its role as an isolation and conversion interface. Within the related range, the D-CIJ3D is identified as the RDL white/gray version, while the DS-CIJ3D is identified as the stainless-steel version; the DB-CIJ3D covered here is the black model.

Final Assessment

The RDL DB-CIJ3D is a focused solution for routing stereo unbalanced line inputs into balanced stereo equipment connections. It combines gold-contact left and right RCA/phono inputs, a 3.5 mm stereo input, transformer isolation, hum cancellation, and a detachable terminal-block output. Its documented frequency response, no-gain conversion, 10 kΩ equipment-input compatibility, installation dimensions, and operating-temperature range provide the concrete information needed to evaluate it for an installed stereo audio path.