The Radial JDI Passive Direct Box ensures the natural tone and harmonic balance is retained, bringing out the very essence of the instrument. Employing a Jensen audio transformer as the engine and being the world's finest direct box, the JDI delivers smooth, musical tones to the preamp.
The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind. Unlike an active DI that is limited by the buffering amplifiers rail voltage, the Radial JDI employs a Jensen audio transformer as the engine. Jensen transformers are legendary in their ability to gracefully handle transients while delivering a smooth, warm sounding Bessel curve, reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the Radial JDI delivers the natural, pure sound of the instrument without artifact.

The 100% passive circuitry inside the Radial JDI is incredibly efficient. The transformer performs both high-to-low impedance conversion and signal balancing at the same time with minimal loading and does so without any power whatsoever. The transformer also introduces a magnetic bridge that passes signal while rejecting stray DC voltage. This makes the Radial JDI particularly adept at eliminating hum and buzz caused by ground loops.

Features include input and throughput ¼ connectors, -15dB input pad, ground lift, and 180º degree polarity reverse to help phase align the instrument with the PA. A secondary circuit is added for direct interfacing with high output devices such as guitar or bass amp loudspeakers plus a unique merge function allows stereo sources such as keyboards to be summed mono, saving valuable input channels.

Built tough to handle the abuse of live touring, the Radial JDI features a 14-gauge steel I-beam inner frame and a unique book-end outer shell. The innovative design eliminates stress on the PCB, reducing opportunity for solder joints to go cold while the outer shell creates a protective zone around the switches and connectors. The steel casing resists noise-causing electromagnetic pollution and the transformers sensitive inner workings are further protected from magnetic fields with a MuMETAL® can. This ensures the signal transfer is quiet and free from hum.

These combined features have made the Radial JDI the most popular passive direct box in professional touring and an excellent choice for instrument interface in the studio!

Radial JDI Passive Direct Box Features

• Jensen Transformer equipped passive DI
• Eliminates hum and buzz from ground loops
• Virtually zero phase & harmonic distortion
• Exceptional signal handling and noise rejection
• Best-sounding passive DI in the world
• Authentic Jensen Transformer equipped passive DI
• Linear frequency response from 10Hz ~ 40kHz
• Extraordinary level handling without distortion
• Built to survive the road
• Plug-&-Play Design - Easy-to-use!
• No battery or phantom-power required
• Impossible to overload!
• Up to 8 may be rack-mounted with the J-Rak

Radial JDI Passive Direct Box Specifications

• Specs:
  • Audio Circuit Type: Passive, transformer based
  • Number of Channels: Single channel (mono)
  • Frequency Response: 20Hz ~ 20KHz (± 0.2dB)
  • Dynamic Range: 135dB
  • Maximum Input: +21dB @ 20Hz ~ 20kHz
  • Total Harmonic Distortion: 0.05% from 20Hz ~ 20kHz @-10dB
  • Phase Deviation: 0.3° @ 100Hz; 3° @ 20Hz
  • Input Impedance: 140k Ohms, unbalanced
  • Output Impedance: 150 Ohms, balanced
• Features:
  • Transformer: Jensen JT-DBE, 12:1 ratio
  • Shield: Dual Faraday, mu-metal can
  • Input Pad: -15dB
  • Merge: Sums left & right sources to mono
  • 180-degree Polarity Reverse: Inverts absolute phase
  • Ground Lift: Disconnects pin-1 at XLR output
  • XLR Configuration: AES standard (pin-2 hot)
  • Speaker Filter: -30dB pad and band-pass filter
  • Connectors: 1/4-inch in & thru, XLR-M out
• General:
  • Construction: 14 gauge steel chassis & outer shell
  • Finish: Durable powder coat
  • Size: (L x W x D) 5" x 3.3" x 1.8" (127mm x 84.1mm x 45.5mm)
  • Weight: 1.55 lbs (703 grams)
  • Shipping Size: L x W x D: 6.5" x 4" x 3" (165mm x 102mm x 76mm)
  • Shipping Weight: 1.92 lbs (870.9 grams)
  • Power: Passive, no power required
  • Conditions: For use in dry locations only between 5°C and 40°C

Radial JDI Passive Direct Box Applications

• Ideal for acoustic guitars and basses
• Keyboards, modules and electronic drums
• Great with high-output, electronic instruments
• Eliminates hum & buzz in sound systems

Radial JDI Passive Direct Box Includes

• Radial JDI Passive Direct Box
• Manual & Literature
• Radial Sticker
• 3 Year Warranty