Radial JDI PASSIVE-DI
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Information
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Manufacturer Information
Radial
https://www.radialeng.com
info@radialeng.com
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Safety manager:
Algam SAS
Email: contact@algam.net
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The Essentials to Know About the Radial JDI Direct Box
- High-end passive DI with Jensen transformer and Mu-Metal shielding for a clean and natural signal.
- Handles without flinching the very high output levels of keyboards, basses, and active instruments, without saturation or audible distortion.
- Complete stage/studio functions: input, "thru" output, Merge, balanced XLR output, PAD, phase inverter, ground lift, and "Speaker" mode.
- Ultra-robust and compact chassis, built for touring as well as studio use.
A Professional Classic Alongside the J48
Designed as the passive counterpart to the J48, the Radial JDI forms a duo highly praised by sound engineers. Its fully passive design and reference Jensen transformer provide a particularly musical reproduction, faithful to the source, with exemplary phase stability. It thus establishes itself as a reliable standard, equally comfortable on stage and in studio recording.
For Whom and For What Uses?
The JDI is aimed at musicians, backliners, and sound engineers seeking a "plug and play" DI capable of handling the most demanding signals without faltering. Ideal for mobile setups, TV studios, and high-turnover studios, it guarantees hassle-free passive powering and remarkable sonic consistency.
- Basses and acoustic or electro-acoustic guitars
- Keyboards, synthesizers, modules, and electronic drums
- Instruments and sources with high output levels
- Elimination of "hums" and "buzz" caused by ground loops
Technical specifications
| Category | Direct box | THD | 0,05% @ -10 dB |
| Number of channels | 1 | Inputs | jack |
| Digital conversion | No | Analog outputs | jack, XLR |
| Max input level (dBu) | 21 | Color | Green |
| Signal-to-noise ratio | 119 dB | Power supply | Passive |
| Settings | -15 dB attenuator, 30 dB attenuator + bandpass filter, ground lift switch, phase inverter, input summing | Weight | 703 g |
| Frequency response | 20 Hz - 20 kHz | Dimensions (mm) | 127 x 84,1 x 45,5 |
Questions frequently asked
Does the Radial JDI operate without phantom power?
Fully passive, this direct box requires no external power or phantom power.
Can a bass, keyboard, or synthesizer be connected to this DI?
The jack input accepts basses, acoustic or electro-acoustic guitars, keyboards, synthesizers, modules, and electronic drum kits. A jack Thru output allows sending the signal to an amplifier or other equipment.
How does the JDI handle ground loops and phase issues?
A ground lift switch addresses hum and buzz caused by ground loops. The phase reverse switch helps correct polarity issues in an audio system. The Mu-Metal shielding reduces electromagnetic interference around the Jensen transformer.
Can the Radial JDI accept a guitar amplifier signal?
The Speaker mode, combined with 30 dB attenuation and the band-pass filter, allows parallel pickup from a speaker cabinet with a typical 12-inch guitar tone curve.
What connections and input level does this passive DI offer?
Connections include a jack input, a balanced XLR output, and a 6.35 mm jack Thru output. The maximum input level is 21 dBu, with a -15 dB PAD for hot sources.



