Radial (R800 1010) Direct Box - Single Channel

Passive direct box

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What's in the box:

  • Radial Engineering JDI Mk3 - Professional Passive Direct Box with Jensen Transformer
  • Three (3) Year Transferable Warranty


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Handles high-output, active instruments with a musicality that audio engineers love

The Radial JDI is considered by many to be the world’s finest direct box. It is a passive DI that employs a Jensen isolation transformer for optimum audio performance, offering outstanding linearity at all frequencies and extraordinary level handling without introducing distortion. A completely passive direct box, the plug & play JDI does not require any powering and has the unique advantage of eliminating 60-cycle ground loops. This makes the JDI a definite favorite with informed audio engineers. It's great for guitars, bass, and keyboards and is particularly adept with high-output, broadband instruments, such as active instruments and digital keyboards.


  • Jensen transformer equipped passive DI
  • 100% isolation eliminates ground loops
  • Virtually zero phase & harmonic distortion
  • Exceptional signal handling
  • High common mode noise rejection

Specifications for the Radial (R800 1010) Direct Box

{ "Audio circuit type:" : "Passive, transformer based", "Transformer:" : "Jensen JT-DBE", "Number of channels:" : "Single channel (mono)", "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", "Features" : [ "Input pad", "Mono Sum", "180° polarity reverse", "Ground lift", "Speaker filter" ], "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" } }

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