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Item # 153902 | Customer Ratings: Ratings ( 5 Based on 4 reviews)

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Radial Engineering JDI MK3 Passive Direct Box
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      Radial Engineering JDI MK3 Passive Direct Box (153902)
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Durable for everyday use and high-caliber for crucial usage.

The Radial JDI MK3 Passive Direct Box is a Jensen transformer equipped, high-quality passive direct box that has the advantage of providing complete isolation for reduced noise. The exceptionally low phase distortion, almost perfect linear response, and low harmonic distortion make the JDI direct box a superb choice for recording or live performance. The rugged construction allows it to be used in abusive environments without concern. The Radial JDI Mk3 is ideal for acoustic guitars, bass, and keyboards.

Considered by many to be one of the finest passive-operation direct boxes available, this Radial DI employs a Jensen isolation transformer for optimum audio performance. 60-cycle ground loop elimination and adept handling of high-output, active instruments and keyboards make the Radial JDI discrete and versatile. Steel I-beam construction, baked enamel finish, and protected faceplate mean Radial JDI is built to survive.

The Radial JDI passive direct box employs the Jensen JT-DBE transformer as its main drive engine. The Jensen DBE transformer employs a laminated nickel core with low-permeability and no magnetic memory, therefore eliminating phase distortion caused by the disruption of fundamentals and harmonics.

The distinctive book-end design protects the switches against damage from abuse by providing a protective zone on both I/O panels. A baked enamel finish resists scratching while a no-slip rubberized pad on the bottom stops the JDI direct box from moving around and aids isolation. Inside, the Radial JDI features compound, welded I beam construction that protects the sensitive electronics from outside stress. The internal skeletal frame is locked together with 4 hex screws.

The input panel features a 1/4" instrument input and traditional thru-put. An innovative merge function allows the thru-put to be converted to a second input to allow stereo to mono summing. This is useful for interface with stereo sources such as keyboards or CD players in live shows where audio channels may be not always be plentiful. The Radial JDI also sports a -15dB pad to interface with higher output levels.

The output panel features a balanced 600-ohm XLR connector with pin-2 hot following the AES specification. A polarity reverse switch toggles pin-2 and pin-3 to allow the JDI direct bpx to interface with older non-AES equipment and for creative tinkering. The ground lift switch disconnects the XLR pin-1 ground from the Radial JDI for 100% input-to-output isolation. A second -30dB pad used in tandem with the -15dB input pad allows the JDI to be connected in parallel with a speaker. This, for instance, allows the engineer to tap the sound coming from a guitar amplifier speaker post-distortion thus adding another creative dimension. This unique function incorporates a speaker emulation filter circuit.

The JDI input features a high 10kOhm input impedance for minimal loading. This makes the Radial JDI ideal for interface with all instruments. The 600-ohm mic level output allows the JDI box to be used with typical snake systems that incorporate bridging transformers (splitters) without fear of overloading them.

As a passive device, the JDI direct box is particularly ideal for use with high output devices such as active or self-powered instruments such as acoustic guitars and basses with built-in battery-powered preamps, and AC-powered equipment such as drum machines, DJ mixers, and keyboards. These devices tend to overload most active direct boxes making them sound thin and edgy. The Radial JDI direct box is capable of exceptionally high signal handling without distortion.

Radial Engineering JDI MK3 Passive Direct Box Features:

  • 100% passive design - no phantom power
    Jensen transformer equipped
    Dual function inputs w/2 channel merge
    Polarity reverse switch
    Speaker level input circuit
    Ultra-durable welded steel chassis
    Double sided printed circuit board
    Protective channel for switches
    Ground Lift and Pad switches
    No-slip bottom pad


Radial Engineering JDI MK3 Passive Direct Box Specifications:

  • Dynamic range: 135dB
    Signal to noise: 119dB
    Maximum input level: +19dB
    Frequency range: 10Hz~40kHz
    Linearity 20~20kHz: 0.1dB
    Phase coherence: 4 degrees at 20Hz
    0 degrees at 1kHz
    Distortion at 20Hz: 0.006%
    CMR rejection 100dB @60Hz
    Input impedance: 10kW
    Output impedance: 600W
    Construction: Welded steel
    Finish: Baked enamel
    Input connectors: Two 1/4" phone
    Output connectors: XLR male


Radial Engineering JDI MK3 Passive Direct Box

90 day warranty on footswitch and tubes. One year warranty on all other products.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 4 reviews)
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Viewing Reviews 1 - 3 of 4 |
  • Incredible

    As reviewed by Kevin Glenn on 9/20/2006

    This green DI box is just awesome. I am using it to send the sound my of Spector Euro 5 LX bass to the sound guy at shows. The sound is dead on: my bass sounds like my bass through the PA system - nothing added and nothing subtracted from my original tone. The unit is tough steel and will survive ANY kind of punishment. The parts are of the highest quality. Don't settle for a cheap DI box, buy this one.

    9 of 9 people found this review helpful.
    Was this review helpful?
  • Very Clear Sound thru PA

    As reviewed by Rickie on 11/4/2009

    The Radial JDI gives me tremendous clarity with my acoustic guitar. The difference between a DI and the Radial JDI is so obvious to your ears. (OK, the price difference is so obvious to your wallet). Anyways, if you have a decent guitar and you want it to come out of the PA with no loss in sound quality then you have to go with this. You can really hear the difference.

    7 of 7 people found this review helpful.
    Was this review helpful?
  • Radial JDI top notch

    As reviewed by John Nyerges on 1/22/2011

    We compared this DI to others in a studio setting mostly with electric bass and found that this blew all the others away. The bass frequencies came through more focused, in phase, quiet and full. Just beautiful, built like a tank. Don't waste your money on a cheap DI. I own one. I bought several of the active and passive versions for our studio.

    2 of 2 people found this review helpful.
    Was this review helpful?
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