Radial Engineering JDI Stereo Passive DI Box

We offer competitive pricing on our Radial Engineering products - contact us for pricing!

The World’s Finest Passive Stereo DI

The Radial JDI Stereo is a high performance passive stereo direct box designed for professional concert touring and studio recording. Built around two premium Jensen transformers, it delivers exceptional audio performance and is the industry's go-to solution for capturing the true character of any instrument. The JDI Stereo is designed to handle extreme signal levels without distortion of any kind.

Jensen Transformer

The JDI is built around two high quality Jensen JT-DB-EPC audio transformers. Jensen transformers are renowned for their ability to gracefully handle transients, delivering a smooth, warm Bessel curve. Ruler flat from 10Hz to 40kHz with virtually zero phase deviation. The result is the pure, natural sound of the instrument with no artefacts.

Passive vs Active Circuit

Unlike an active DI that is limited by its rail voltage and clips hard when overloaded, a transformer saturates gracefully. When you push a Jensen transformer hard it naturally rounds out the transient, acting more like a soft limiter than a hard clip. The JDI Stereo requires no power whatsoever: the transformer performs both high-to-low impedance conversion and signal balancing simultaneously, passing signal while rejecting stray DC voltage. This passive design makes it particularly effective at eliminating hum and buzz caused by ground loops, and means it works on any stage or studio setup without phantom power or batteries.

Being a passive DI, the Radial JDI Stereo manages impedance conversion and signal balancing over an isolated magnetic bridge. This bridge passes the pure instrument signal while filtering out stray DC voltage that causes noise. This makes the JDI Stereo particularly good at eliminating hum and buzz caused by ground loops.

Radial JDI Features:

• Equipped with two Jensen JT-DB-EPC audio transformers.
• Passive design requires no power, batteries, or phantom power.
• Ruler flat response from 10Hz to 40kHz with zero phase deviation.
• Musical transformer saturation on transients rather than hard clipping.
• 100 percent isolation to eliminate ground loop hum and buzz.
• Dual mu-metal cans for superior transformer shielding.
• Individual -15dB pads for handling high output line level sources.
• Independent ground lift switches for each channel.
• Stereo 1/4 inch inputs and thru-puts with balanced XLR outputs.