Radial J-iso Stereo Converter
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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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A Radial solution designed for the "clean" audio interface between two worlds
The Radial J-Iso fits the brand's typical approach: offering a simple-to-integrate audio tool designed to solve a very concrete problem on stage and in the studio. Between professional line-level equipment and consumer-level devices, differences in level and wiring standards can quickly complicate connections, cause extreme adjustments, or simply degrade the experience. With its passive design and Jensen transformers, the J-Iso aims for a stable and high-quality interface, with particular attention to signal integrity.
Who the Radial J-Iso is for and when to use it
The J-Iso is made for those who need to cleanly connect a pro-format output to a more "consumer" input, without jury-rigging or unnecessary compromise. It suits studios, live setups, and fixed installations (control rooms, rehearsal spaces, home studios).
It is especially relevant if you use a device with a balanced +4 dB output and need to feed an input expecting -10 dB: for example, certain recorders, multimedia solutions, hi-fi equipment, or broadcast chains operating at lower levels. In practice, it helps you regain gain consistency: fewer volume adjustments, less risk of input clipping, and a more comfortable dynamic headroom.
Technical specifications
| Category | Direct box | THD | 0,001% @1 kHz / +4 dBu |
| Number of channels | 2 | Inputs | 2 x XLR |
| Digital conversion | No | Analog outputs | 2 x jack, 2 x Rca, minijack |
| Valve | Yes | Power supply | Passive |
| Max input level (dBu) | 20 | Weight | 700 g |
| Settings | ground lift switch, output level | Dimensions (mm) | 84 x 127 x 48 |
| Frequency response | 20 Hz - 20 kHz | ||
Questions frequently asked
How to connect a +4 dB XLR output to a -10 dB RCA input?
The 2 XLR inputs receive a balanced +4 dB signal, then the conversion reduces the level to -10 dB. The outputs include 2 RCAs, 2 jacks, and a minijack for compatibility with consumer devices.
Is the Radial J-Iso suitable for a stereo keyboard?
Its 2-channel design preserves the left and right channels of a stereo source. The specified frequency response ranges from 20 Hz to 20 kHz.
Is a power supply needed for this stereo converter?
Passive operation requires neither an AC adapter nor batteries.
Do the Jensen transformers provide audio isolation?
The interface includes Jensen transformers for signal conversion and isolation. The specified total harmonic distortion is 0.001% at 1 kHz and +4 dBu. A ground lift switch helps address ground loop issues in an audio system.
What is the maximum input level accepted by this direct box?
The maximum input level specified is +20 dBu. An output level control is provided to adjust the signal sent to the connected equipment.
