Radial JDI Duplex - Jensen Equipped 2-channel Passive Instrument Direct Box

Passive Direct Injection Box with Two Jensen Transformer-equipped Channels
Radial JDI Duplex - Jensen Equipped 2-channel Passive Instrument Direct Box image 1
Radial JDI Duplex - Jensen Equipped 2-channel Passive Instrument Direct Box image 1
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Radial JDI Duplex - Jensen Equipped 2-channel Passive Instrument Direct Box
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Two Channels of Noise-free DI!

The Radial JDI Duplex 2-channel passive direct box delivers great sound and rock-solid reliability, whether you use it onstages or in the studio. The JDI Duplex features Jensen transformers to give you the best performance possible at all frequencies. This box can handle very high signal levels without distorting, and its passive design helps to eliminate 60-cycle ground loops. Great for everything from passive and active guitars and basses to analog and digital keyboards, the Radial JDI Duplex is a dependable, quality performer!

Radial JDI Duplex 2-channel Passive DI at a Glance:
  • Jensen transformer for optimum performance
  • 100% isolation eliminates ground loops
  • Virtually zero phase & harmonic distortion
  • Exceptional signal handling
  • High common mode noise rejection
  • Welded I-beam construction
Jensen transformer for optimum performance

The JDI Duplex's Jensen transformer is the product of decades of experience in transformer production. This transformer delivers optimum audio performance offering outstanding linearity at all frequencies, combined with extraordinary level handling without introducing distortion.

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

The JDI's output panel features balanced 600-ohm XLR connectors with pin-2 hot following the AES specification. A polarity reverse switch toggles pin-2 and pin-3 to allow the JDI to interface with older non-AES equipment and for creative tinkering. The ground lift switch disconnects the XLR pin-1 ground from the JDI for 100% input-to-output isolation.

Finally, a second -30dB pad may be engaged that, when 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 that rolls off highs and lows to more closely approximate the sound of a 12" driver.

As with all Radial direct boxes, the Radial JDI is designed for use in abusive environments such as on fast-paced stages of concert touring. An innovative book-end design provides a protective zone around the switches and connectors that makes it practically impossible to damage these components.

The inner skeletal frame features a unique 14-gauge welded I-beam construction that makes it impossible to torque the PC board. Stress on the printed circuit board can introduce intermittent solder joints, which by all accounts is the primary cause of direct box failure.

An innovative full-bottom no-slip rubberized pad works double duty by assuring the J48 won't slip and slide around when placed on an amplifier. The protective pad also ads an element of electrical shock resistance by providing a mechanical shield from guitar amp handles that are often directly coupled to the amp chassis.

Radial JDI Duplex 2-channel Passive DI Features:
  • Welded I-beam construction makes it impossible to torque the PC board. This virtually eliminates cold solder joints - the No.1 cause of system failure in the field.
  • An innovative 'slide-in-place' XLR trace makes it possible to use I-Beam girder construction.
  • Jensen transformer for distortion-free performance.
  • A military-grade PC board is employed for maximum wear and tear in abusive environments. Welded steel standoffs ensure the PC board will not shift.
  • A -15dB pad allows super hot inputs such as that from a CD player to be connected and balanced for long runs.
  • The Merge function turns the input and thru into a passive mixer to sum stereo feeds to mono at the XLR output. This saves valuable inputs on the mixer!
  • The input connects to the instrument.
  • The thru-put is connected to the instrument amplifier. The JDI has a high input impedance to reduce loading.
  • Our book-end design creates a protective zone around the switches & connectors for best protection!
  • A heavy-duty baked enamel finish for excellent durability and great looks for years! 100% 14-gauge steel construction.
  • The XLR balanced mic level output provides 100% isolation for runs to 1000 feet without appreciable noise.
  • A polarity reverse switch flips the polarity from the AES standard Pin-2 to Pin-3 on the XLR and is used when combining sounds that may be out of phase.
  • The ground-lift disconnects the ground path to the transformer at the XLR output. This is used when a ground path is made at the input side such as with a keyboard.
  • The parallel speaker interface option introduces a second -30dB pad with band-pass filter to emulate a 12" guitar speaker.
  • A no-slip full bottom pad reduces mechanical vibration, improves electrical isolation and keeps the JDI from moving around on busy stages!
The Radial JDI Duplex is a solid choice onstage and in the studio!

Additional Media

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Tech Specs

Type Passive DI
Channels 2
Inputs 2 x TRS in parallel, 4 x RCA, 2 x XLR
Outputs 2 x TRS in parallel, 2 x XLR
Height 2"
Width 7"
Depth 5.5"
Weight 4.4 lbs.
Manufacturer Part Number R800 1020

Customer Reviews

Based on 6 reviews
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Clean Radial Signal

You cant go wrong with any Radial unit. I have used these for years, they are indestructible and provide a clean sound free of any rf or hums. I use them live and in the studio..... Well made built like a tank.
Music background: Recording Engineer, FOH house of worship

Very Smooth Direct Box

This is the best direct box I've ever used. It's really lets the true sound of the instrument pass through, and handles really hot inputs quite nicely. I'm using this with keyboards as well as basses. The box itself is quite heavy, but that's also what makes it rugged. There's no microphonics (meaning if you hit it, it doesn't make any sounds, unlike some other direct boxes I've used in the past). This DI is well worth the extra $$$ compared to it's competitors.
Music background: Recording Engineer

Indispensable tool

Love it on my synths, both on stage and in studio, worth every penny.
Music background: Musician

Nice piece of gear!

Nothing too sexy about a DI, but this thing really makes a difference in my sound, and it serves many functions--two channels of DI for live shoes and perfect for recording my MOTIF!
Music background: Musician and project studio engineer

Works Invisibly

Not much to add here - industry standard for a reason, it seems. The transformer color is lovely if you push the box a bit; other than that it sounds transparent. Duplex format is convenient.
Music background: Electronic Musician, Engineer
See also: Direct Input Boxes, Radial, Radial Direct Boxes