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Radial JDI Passive DI Box
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Radial JDI Passive DI Box

Product Code: 403550

The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind.

£179.00 (INC VAT)
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Radial JDI Passive DI Box

The Radial JDI employs the world class Jensen JT-DB-EPC audio transformer 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 JDI delivers the natural, pure sound of the instrument without artifact. By its no-power passive design, the Radial JDI performs both high-to-low impedance conversion and signal balancing over a magnetic bridge that passes signal while rejecting stray DC voltage. This makes the JDI particularly adept at eliminating hum and buzz caused by ground loops.




  • Jensen Transformer equipped passive DI
  • Eliminates hum and buzz from ground loops
  • Virtually zero phase & harmonic distortion
  • Exceptional signal handling and noise rejection



JDI Applications


JDI with Electric Bass

  • The JDI is often selected for high output bass guitars. It is able to handle huge signal levels without distortion or artifact. On stage it sends the pure sound of the bass to the PA with minimal loading. In studio, it is perfect for recording direct.


JDI with Acoustic Guitar

  • Most acoustic guitars have built-in preamps that can be peaky. The JDI naturally smoothes out the transients for a warmer tone. And because the JDI is able to handle huge transients, it will not distort. This makes the JDI a great direct box for acoustic guitars.


JDI with Keyboards

  • Today's digital keyboards are not only very dynamic, some like digital pianos have a tremendously wide frequency response. The Radial JDI is able to withstand excessive signal levels at all frequencies without introducing distortion or phase shift.
  • * Audio circuit type: Passive, transformer based
  • * Transformer: Jensen JT-DBE
  • * Number of channels: Number of channels:
  • * Frequency response: 20Hz ~ 20KHz (± 0.2dB)
  • * Dynamic range: 135dB
  • * 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
  • * Maximum Input: +21dB @ 20Hz ~ 20kHz
  • * Construction: 14 gauge steel chassis & outer shell
  • * Finish: Durable powder coat
  • * Size (L x W x D): 127mm x 84.1mm x 45.5mm
  • * Weight: 703 grams
Customer Reviews
  • Verified Customer
    on 17 June 2011
    I know it is expensive compared to others but Radial products are just the best and gives me great confidence they will perform at gigs and corporate events. I love the simple design and the careful thought that has gone into the design. Input merge function is brilliant!