Radial Jdi Duplex DI Passive

A Logical Evolution of the JDI, Designed for Modern Setups

While the Radial JDI has established itself as a studio and stage reference, the JDI Duplex carries its DNA forward while addressing two very concrete needs: more connections and true stereo management (or dual mono). Designed to offer maximum flexibility to sound engineers, it is based on a high-end passive architecture, with two independent channels and an expanded interface to accommodate a wide variety of sources, from instruments to multimedia equipment.

Within the Radial range, the JDI Duplex positions itself as an "all-in-one" solution to secure the audio chain: impedance matching, galvanic isolation via transformers, and practical signal control without requiring external power. The goal is clear: to obtain a usable, stable, and musical signal regardless of stage or patch constraints.

For Whom and What: From Studio to Stage, and From Instrument to Audio Player

The JDI Duplex is aimed at those who need to connect sometimes finicky, often powerful, and always different sources: keyboards, samplers, electronic drums, sound modules, active basses, acoustic guitars with preamps, as well as audio outputs from computers, interfaces, or players. It is also very relevant for "taming" digital sources considered too direct, providing a more organic response and better integration into a mix.

Thanks to its two channels, it can serve as a stereo DI (keyboard, module, playback) or a dual DI (two instruments, two submixes, two lines). And when the context requires mono operation, the summing function simplifies routing without sacrificing the coherence of your setup.

A Passive DI Designed for High-Level Signals

Jensen Transformers: Warmth, Precision, and Isolation

The heart of the JDI Duplex relies on a pair of Jensen transformers, renowned for their ability to transfer the signal with great stability and musical fidelity. The result aims to preserve the character of the instrument while reducing common stage issues: induced noise, interference, ground potential differences between devices, or hum caused by ground loops. This "quality-first" approach makes the JDI Duplex a direct box suited for demanding situations where a clean signal is expected right at the console input.

Extended Connectivity: Plug In, Adapt, Secure

Each channel features parallel 6.35mm Jack and RCA inputs, plus a dedicated XLR input for line-level sources. The idea is to quickly integrate an instrument source, a player output, or professional equipment without multiplying boxes and adapters. The XLR outputs send the signal to the console, while the thru output maintains a path to an amplifier or a high-impedance device.

Signal Control: The Right Switches in the Right Place

On the front panel, Radial includes essential functions to save time and avoid surprises. The -15 dB PAD helps handle very strong signals, the ground lift switch quickly addresses hum issues, the polarity inverter facilitates coherence in multi-source setups, and the input selector optimizes the choice of the active source. Finally, the Merge (summing) function allows grouping inputs to feed a mono output when the stage plan or console input requires it.

Radial Durability: Ready for the Road

The JDI Duplex is designed to be handled, transported, and used in tough environments. Its robust chassis protects connectors and switches, while the design aims to minimize mechanical stress on the electronics. On stage or in performance, this is the type of DI you deploy without hesitation: reliable, stable, and built to last.

Technical specifications

Frequency response - start	20 Hz	Settings	-15 dB attenuator, ground lift switch, phase inverter, input selector, input summing
Frequency response - end	20 kHz	THD	0,001% @1 kHz / +4 dBu
Category	Direct box	Inputs	2 x XLR, 2 x jack, 2 x Rca, minijack stéréo
Number of channels	2	Analog outputs	2 x jack, 2 x XLR
Digital conversion	No	Power supply	Passive
Max input level (dBu)	20	Weight	1.43 kg
Signal-to-noise ratio	119 dB	Dimensions (mm)	210 x 159 x 83

Tubes	no	Outputs	2 x jack, 2 x XLR
Built-in preamp	no	Controls	-15 dB attenuator, ground lift switch, phase inverter, input selector, summing, input summing
Frequency response	20 Hz - 20 kHz	Weight (kg)	1.43
Maximum input level (dBu)	20