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Radial JDI Passive Direct Or DI Box With Jensen Transformer

RA-JDI

$309.00 $409.00

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Description

Radial JDI Passive Direct Or DI Box With Jensen Transformer

  • Jensen Transformer equipped passive DI
  • Eliminates hum and buzz from ground loops
  • Virtually zero phase & harmonic distortion
  • Exceptional signal handling and noise rejection

The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind. Unlike an active DI that is limited by the buffering amplifier’s rail voltage, the JDI employs a Jensen audio transformer as the engine. Jensen transformers are legendary in their ability to gracefully handle transients while delivering a smooth, warm sounding Bessel curve, reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the JDI delivers the natural, pure sound of the instrument without artifact.

The 100% passive circuitry inside the JDI is incredibly efficient. The transformer performs both high-to-low impedance conversion and signal balancing at the same time with minimal loading and does so without any power whatsoever. The transformer also introduces a magnetic bridge that passes signal while rejecting stray DC voltage. This makes the JDI particularly adept at eliminating hum and buzz caused by ground loops.

Features include input and throughput ¼” connectors, -15dB input pad, ground lift, and 180º degree polarity reverse to help phase align the instrument with the PA. A secondary circuit is added for direct interfacing with high output devices such as guitar or bass amp loudspeakers plus a unique merge function allows stereo sources such as keyboards to be summed mono, saving valuable input channels.

Built tough to handle the abuse of live touring, the JDI features a 14-gauge steel I-beam inner frame and a unique book-end outer shell. The innovative design eliminates stress on the PCB, reducing opportunity for solder joints to go ‘cold’ while the outer shell creates a protective zone around the switches and connectors. The steel casing resists noise-causing electromagnetic pollution and the transformer’s sensitive inner workings are further protected from magnetic fields with a MuMETAL® can. This ensures the signal transfer is quiet and free from hum.

These combined features have made the Radial JDI the most popular passive direct box in professional touring and an excellent choice for instrument interface in the studio!

The Radial JDI… the world's finest passive direct box.

JDI with Electric Bass

The JDI is often selected for high output bass guitars. It is able to handle huge signal levels without distortion or artifact. On stage it sends the pure sound of the bass to the PA with minimal loading. In studio, it is perfect for recording direct.

JDI with Acoustic Guitar
Most acoustic guitars have built-in preamps that can be peaky. The JDI naturally smoothes out the transients for a warmer tone. And because the JDI is able to handle huge transients, it will not distort. This makes the JDI a great direct box for acoustic guitars.
 
JDI with Keyboards
Today's digital keyboards are not only very dynamic, some like digital pianos have a tremendously wide frequency response. The Radial JDI is able to withstand excessive signal levels at all frequencies without introducing distortion or phase shift.

Specifications

JDI™ Specifications

The Radial JDI is a phase coherent, passive direct box employing a nickel laminated Jensen™ audio transformer with virtually zero phase distortion, huge dynamics handling and ruler flat response from 10Hz to 40kHz. The Radial JDI™ is quite simply the world's finest passive direct box. With its heavy-duty steel shell and internal I-beam construction, the JDI is designed to work dependably for years in even the harshest of touring environments. Ideal for keyboards, bass and acoustic instruments of all kinds, the JDI Duplex™ and JD6™ are also available for stereo and multi-channel applications.

 
Radial JDI Block Diagram
Radial JDI Frequency Response
Radial Green Report

The Radial Green Report In effort to provide the more discerning audio engineer with all of the technical support materials to make a proper and informed decision, we have produced the Radial Green Report. This provides in-depth distortion tests and analysis of four popular direct boxes....     View the pdf
Specifications    RADIAL JDI
Audio circuit type:  Passive, transformer based
Number of channels: Single channel (mono)
Frequency response:  20Hz ~ 20KHz (± 0.2dB)
Dynamic range:  135dB 
Maximum input:  +21dB @ 20Hz ~ 20kHz 
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 
   
Features     
Transformer: Jensen JT-DBE
Shield: Dual Faraday, MuMETAL® can
Input pad:  -15dB  
Merge:  Sums left & right sources to mono
180° polarity reverse:  Inverts absolute phase
Ground lift:  Disconnects pin-1 at XLR output 
XLR configuration:  AES standard (pin-2 hot) 
Speaker filter:  -30dB pad and band-pass filter 
Connectors: 1/4" in & thru, XLR-M out
   
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
Warranty:  Radial 3-year, transferable
Specifications are subject to change without notice.
*MuMetal is a registered trademark of Magnetic Shield Corp.
Radial JDI Duplex THD vs Frequency
Radial JDI Duplex THD vs Output
Radial JDI Phase Shift Graph
Radial JDI Noise Spectrum Graph
Radial JDI Fast Fourier Transform Graph
Radial JDI IMD vs Output Graph

Features

JDI™ Features

 

Radial JDI Features

Reviews

Please Note: This item may be on display at the Mooloolaba Music Shop and may have been available for demonstration to in store patrons. We take careful and meticulous care, boxing and cleaning of your product before the shipping or selling of an item. If you do want photos beofre making a purchase please call our shop where one of our staff can assist in sending more detailed images.

Mooloolaba Music reserves the right to cancel, at any time before delivery and for whatever reason, an Order that it has previously accepted. Mooloolaba Music may do this for example, but without limitation, where:

a) Mooloolaba Music's suppliers are unable to supply Goods that they have previously promised to supply
(b) an event beyond Mooloolaba Music's control, such as storm, fire, flood, earthquake, terrorism, power failure, war, strike or failure of computer systems, means that Mooloolaba Music is unable to supply the Goods within a reasonable time
(c) Goods ordered were subject to an error on the Website, for example, in relation to a description, price or image, which was not discovered prior to the Order being accepted;
(d) The products shown in the images above product may differ to the purchased product. Changes could include, different stands, treatments, slight variations in colour, In-built batteries and charging ports. Please contact our team for further clarification.

We ask that you research parts carefully before buying.
Purchase of any non-licenced part as a replacement spare part is at your own risk.
Some branded replacement parts also require professional installation to fit correctly.
If in doubt we will be happy to advise further and confirm suitability before purchase.

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