JDI Duplex™ Specifications

Radial JDI Duplex is a high performance dual-channel direct box that is designed to provide maximum flexibility for the audio engineer in the most demanding applications. It features two custom-made nickel laminated transformers for optimal signal transfer with absolute minimal distortion of all types. Analysis reveals an exceptionally linear response from 10Hz to 40kHz with virtually zero phase shift at all critical frequencies. The excellent performance is further substantiated with a Fast Fourier transform that produces desirable even order harmonic generation and a warm Bessel curve when pushed hard. With its heavy-duty steel shell and internal I-beam construction, the Duplex is designed to work dependably for years in the harshest of touring environments. A full complement of connectors make the Duplex a God-send when faced with the never-ending challenges of professional touring, broadcast and AV integration.

JDI Duplex Block Diagram
Audio circuit type:  Passive, transformer based
Number of channels: Dual channel (stereo)
Frequency response:  20Hz ~ 20KHz (± 2dB)
Dynamic range:  135dB 
Maximum input:  +20dB @ 1kHz 
Total harmonic distortion:  0.001%; 1kHz/+4dBu; 600 Ohm load
Phase deviation:  -1° @ 20Hz; 0.5° @ 150Hz; 600 Ohm load
Input impedance:  140k Ohm PAD off; 10k Ohm PAD on
Input impedance - balanced FXLR:  10k Ohm
Output impedance - balanced MXLR:  600 Ohms
Transformer: Jensen JT-DBE
Shield: Dual Faraday, MuMETAL® can
Input pad:  -15dB (¼" and RCA inputs only) 
Sub mono:  Resistive summing mixer
180° polarity reverse:  Toggles pins 2 and 3 at the XLR outputs
Ground lift:  Disconnects pin-1 at XLR output
XLR input:  +4dB balanced female XLR
XLR configuration:  AES standard (pin-2 hot) 
Connectors: 1/4", RCA, 3.5mm TRS in, XLR-F in, XLR-M out
Construction:  14 gauge steel chassis & outer shell
Finish: Durable powder coat
Size:  (W x H x D) 160mm x 48 x 127mm (6.3" x 1.9" x 5") 
Weight:  1kg (2.2lbs)
Shipping size: W x H x D: 210 x 159 x 83mm (8.25" x 6.25" x 3.25")
Shipping weight: 1.43 kg (3.15 lbs)
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.
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....

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