Consumer Input Jacks-Mono

The RDL DS-CIJ3 is a stainless steel consumer input interface designed to combine stereo unbalanced sources into a mono balanced line-level output. Its three input connections include left and right RCA phono jacks with gold contacts and a 3.5 mm stereo mini-jack. It performs unbalanced-to-balanced conversion without gain while providing transformer isolation and hum cancellation for unbalanced line inputs. The mono output is available on a detachable terminal block and is intended to feed equipment inputs rated at 10 kΩ.

Ideal Use Cases

The DS-CIJ3 is suited to signal paths in which a stereo line-level source must feed a mono balanced equipment input. It accommodates a source connected through left and right RCA jacks or through a stereo 3.5 mm mini-jack. This makes it appropriate when the source connection is unbalanced, the destination requires a balanced mono line signal, and transformer isolation or hum cancellation is needed. Its specified application with 10 kΩ equipment inputs provides a clear destination requirement for system planning.

Why Choose This Model

This model combines several required signal functions in one unit: stereo-to-mono mixing, unbalanced-to-balanced conversion, transformer isolation, and hum cancellation. The conversion is specified without gain, preserving a line-level signal path rather than adding level amplification. Users can connect stereo equipment through either the pair of RCA inputs or the stereo mini-jack, while the balanced mono output connects through the detachable terminal block.

The left and right phono jacks use gold contacts. The DS-CIJ3 is the stainless steel version of the product, making its finish a defining model characteristic. For installations requiring the alternate RDL white/gray finish, the supplied product information identifies that version as the D-CIJ3.

Installation and Integration

The DS-CIJ3 measures 4.13 inches high, 1.7 inches wide, and 2.15 inches deep, equivalent to 10.49 by 4.32 by 5.47 centimeters. The minimum mounting-box dimensions are 1.80 inches wide by 1.75 inches deep, or 4.57 by 4.45 centimeters. These measurements should be checked against the intended mounting location before installation.

Input wiring is handled through the two RCA phono jacks or the 3.5 mm stereo mini-jack. The resulting mono balanced output terminates on a detachable terminal block. Integration should be planned around a line-level destination with a 10 kΩ equipment input. The specified ambient operating environment is 0°C to 55°C.

Performance Highlights

At line level, the stated frequency response is 50 Hz to 20 kHz within ±1 dB. With a wider tolerance of ±2 dB, the response extends from 30 Hz to 20 kHz. The unit mixes stereo inputs into a mono balanced output while converting the incoming unbalanced signal without gain.

Transformer isolation is provided for the unbalanced line inputs, along with hum cancellation for those inputs. Together, these functions address signal conversion and isolation within the same connection path. The output remains line level and is specified to feed 10 kΩ equipment inputs through the detachable terminal block.

What Makes It Different

The defining feature of the DS-CIJ3 is its combination of consumer-source connectors and a balanced mono output arrangement. It accepts both common stereo connection formats listed for the model: separate left and right RCA jacks and a 3.5 mm stereo mini-jack. It then performs stereo-to-mono mixing and unbalanced-to-balanced conversion without gain.

Transformer isolation and hum cancellation are also incorporated for the unbalanced line inputs. This gives the model a broader signal-handling role than connector conversion alone. The stainless steel finish distinguishes the DS-CIJ3 from the white/gray D-CIJ3 while retaining the same stated stereo-input-to-mono-output function.

Final Assessment

The RDL DS-CIJ3 is a focused choice for connecting stereo RCA or 3.5 mm line-level sources to a mono balanced 10 kΩ equipment input. Its documented capabilities include conversion without gain, transformer isolation, hum cancellation, gold-contact RCA jacks, and a detachable output terminal block. The stainless steel construction, defined mounting dimensions, and 0°C to 55°C operating range provide the essential information needed to evaluate it for a planned installation.