Radial Engineering JDI Mk3 Direct Box

Radial Engineering JDI Mk3 - Professional Passive Direct Box with Jensen Transformer

Radial Engineering JDI Mk3 - Professional Passive Direct Box with Jensen Transformer

B&H # RAJDI MFR # R800 1010
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Radial Engineering JDI Mk3 overview

  • 1Description

The JDI Mk3 from Radial Engineering is a professional, passive direct box that converts hi-impedance instrument signals to a balanced low-impedance output, allowing long cable runs without noise. The unit is ideally suited for all instruments including keyboards, bass guitar and acoustic guitars for use in studio, broadcast and live sound reinforcement.

Because of the transformer, the JDI provides 100% isolation between the instrument input side and the balanced output, eliminating hum and buzz caused by ground loops. Passive DIs that use inexpensive iron or steel core transformers can degrade sound through phase shift at various frequencies, a phenomenon known as group delay. This has the effect of making bass sound indistinct, causing the mid-range to smear and lack punch.

The JDI employs a Jensen transformer with a nickel-laminated core which does not retain a memory or polarity. This reduces phase distortion, improves linearity and lowers harmonic distortion. A 15dB pad is provided for high level instruments to avoid input distortion. A merge switch converts the thru output to a second input, allowing two signals, such as those from a stereo keyboard, to be summed to mono when input channel availability is limited.

The unit is built to withstand the abuse of the road. The book-cover design features an internal 14-gauge steel skeleton that is corner welded to ensure the internal electronics will never be subjected to outside stress. The military grade PC board is mounted on steel pem nuts and the whole is then enclosed in a second steel casing. The passive design requires no power source.

Phase coherent professional direct box with 100% passive design and Jensen Transformer equipped
Ultra linear performance from 10Hz to 40kHz
Dual function inputs with two-channel merge
Polarity reverse, ground lift and pad switches
Ultra-durable welded steel chassis with double sided printed circuit board
No-slip bottom pad and protective channel for switches
Ideal for acoustic guitars and basses, keyboards, modules and electronic drums
UPC: 676101034086
In the Box
Radial Engineering JDI Mk3 - Professional Passive Direct Box with Jensen Transformer
  • Three (3) Year Transferable Warranty
  • Table of Contents
    • 1Description

    Radial Engineering JDI Mk3 specs

    Input Connections 1 x 1/4" TS phone
    Output Connectors 1 x XLR
    1 x 1/4" TS phone Thru
    Input Level +19dB
    Output Level Not specified by manufacturer
    Controls -15dB pad
    Polarity reverse
    Ground lift switch
    Merge of Input and Thru
    Parallel 12" speaker emulation switch
    Frequency Response 10Hz to 40kHz
    Noise SNR: 119dB
    Power Passive
    Dimensions (WxDxH) 6 1/2" x 4" x 3" (shipping)
    Weight 1 .92 lbs (shipping)
    Specialties Merge function converts the input and thru output jacks to left and right inputs and mixes them to mono at the XLR
    Packaging Infoeuyarydxudrvcczwzux
    Package Weight 1.88 lb
    Box Dimensions (LxWxH) 6.6 x 4.2 x 3.1"

    Radial Engineering JDI Mk3 reviews

    JDI Mk3 Direct Box is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from GREAT This is exactly what I was looking for . No hum no noise. Different club every weekend now I don't have to worry about hum. Highly recommended.
    Date published: 2010-07-14
    Rated 5 out of 5 by from Great DI Have 4 of them. They work great. Never had a problem.
    Date published: 2014-03-11
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