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.
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