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Radial Engineering JDI-MK3
Passive DI, Ground Lift, Jensen Transformer, 10-80 kHz


The Radial JDI is considered by many to be the world’s finest direct box.
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Radial Engineering JDI-MK3
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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, combined with extraordinary level handling without introducing distortion. Being completely passive, 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.

The JDI is great for guitars, bass, and keyboards and is particularly adept with high-output, broadband instruments such as active instruments and digital keyboards. The JDI may be rack-mounted using the J-Rak and is also available in a stereo (2-channel) version called the JDI Duplex and the 6-channel rack-mountable JD6.

Radial Engineering JDI-MK3 Features:

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

    Radial Engineering JDI-MK3 Specifications:

    • Dynamic Range: 135 dB
    • Signal to noise: 119 dB @ 100 Hz
    • Maximum input: +19V
    • Frequency Range: 10 Hz-40 kHz
    • Linearity 20-20kHz: 0.1 dB
    • Phase coherence: 4Âş at 20 Hz, 0Âş at 1 kHz
    • Distortion at 20 Hz: <0.006%
    • CMR rejection: 100 dB @ 60 Hz
    • Input Impedance: 10 kohm
    • Output Impedance: 600 ohm
    • Construction: Welded steel
    • Finish: Baked enamel
    • Input connectors: Two 1/4" phone
    • Output connectors: XLR male

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