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Radial Duplex 2 Channel Passive DI Box

Radial Duplex 2 Channel Passive DI Box
Radial Duplex 2 Channel Passive DI Box
Radial Duplex 2 Channel Passive DI Box
Radial Duplex 2 Channel Passive DI Box
Radial Duplex 2 Channel Passive DI Box

Radial Duplex 2 Channel Passive DI Box

Item #110826
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USD$349.99 Request Price Match

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Radial Duplex 2 Channel Passive DI Box

Passive Full-Featured Stereo Direct Box
The JDI Duplex™ takes the world’s finest passive direct box one step further, providing numerous connector types to easily interface with any sound source – including line-level devices – while maintaining the highest audio quality and transparency.

Unparalleled tone, multiple connector options
The JDI Duplex takes the exceptional transparency and wide bandwidth of the JDI Stereo passive direct box, and adds numerous connector types and line-level inputs to provide the audio technician with the ability to interface with any stereo sound source. Designed to handle extreme signal levels without distortion, it utilizes two world-class Jensen JT-DB-EPC audio transformers to deliver 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 Duplex delivers the natural, pure sound of the instrument without artifact. The inputs can be accessed via 1/4", RCA, 3.5mm TRS, or XLR line-level connectors, making it easy to plug in any sound source, from stereo instruments to consumer playback equipment, or professional +4dB line-level audio equipment.

Duplex in Multimedia System
Whether you have a CD player, iPod, computer or professional +4dB balanced source, the Duplex can handle any situation.

Duplex with Stereo Keyboard
The Duplex is able to withstand huge transients without distortion. This gives digital keyboards a warm, smooth vintage tone.

Duplex with Two Stereo Sources
With the dual stereo architecture, the Duplex can easily be set up to handle two different stereo sources at the same time.

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.


  • Jensen transformer equipped passive DI
  • Eliminates hum and buzz from ground loops
  • 1/4″, 3.5mm, RCA, and XLR inputs to connect to any source
  • Exceptional signal handling and noise rejection
  • Turns the input & thru jacks into a passive mixer to sum stereo signals to mono.
  • Reduces the input sensitivity to allow high output signals from keyboards to be connected without distortion.
  • Mini TRS provides easy interface for laptops, tablets, smart phones and iPods.
  • Stereo inputs for -10dB consumer level devices such as CD players and other hifi devices.
  • Reverses pin-2 and pin-3 on the XLR output to help phase align the stage sound with the PA system.
  • Lifts the audio ground (pin-1 on the XLR output) to help reduce hum and buzz caused by ground loops;
  • Activates the +4dB line level balanced XLR input and disconnects the ¼" & RCA jacks.


  • Audio circuit type: Passive, transformer based
  • Transformer: Jensen JT-DBE
  • Number of channels: 2
  • Frequency response: 20Hz ~ 20kHz at +/- 0.2dB
  • Dynamic range: 135dB
  • 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
  • Output Impedance: 600 Ohms
  • Maximum Input: +20dB @ 1kHz
  • Features

  • Input pad, Mono Sum, 180° polarity reverse, Ground lift
  • Input Connectors: 1/4", RCA, 3.5mm, XLR
  • Output Connectors: XLR, 1/4" thru
  • Extras: Line Level or hi-Z input
  • General

  • Construction: 14 gauge steel chassis & outer shell
  • Size (L x W x D): 160mm x 48 x 127mm (6.3" x 1.9" x 5")
  • Weight: 1kg (2.2lbs)
  • Shipping size (L x W 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
… [ More ]
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