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Radial Engineering JDI Duplex
Stereo Passive DI Box

OUR PART #:  JDI-DUPLEX

The Radial Engineering JDI Duplex Mk4 is a full-featured passive DI designed to enhance connectivity for the touring professional and AV integrator.
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Our Price: $349.99
List Price: $375.00
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Radial Engineering JDI Duplex
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The Radial Engineering JDI Duplex Mk4 is a full-featured passive DI designed to enhance connectivity for the touring professional and AV integrator. The Duplex comes equipped with 1/4" connectors for -10dB consumer electronics and XLR inputs for +4dB professional line sources.

Like the Radial JDI, the Duplex employs two high-performance 'made in the USA' audio transformers and the same pristine audio signal path that has made the JDI the industry standard. It features exceptional signal handling with virtually zero phase shift or harmonic distortion, while remaining linear across the entire audio spectrum. When driven to extremes, the natural transformer saturation and resulting warm Bessel curve makes the Radial Duplex the perfect choice for smoothing out highly dynamic instruments such as digital pianos and electronic drums that can sound harsh when pushed. Transformer isolation provides the additional benefit of eliminating troublesome ground loops that can cause hum and buzz in the audio system or interfere with video displays.

Radial's innovative 'book-end'™ design provides protective zones that shield connectors and switches from the abuses of professional touring . A welded I-beam inner frame is designed to eliminate outside stresses that could torque the PC board and cause premature solder point and trace failure. A 14-gauge steel shell couples with the mu-metal transformer shield to eliminate stray magnetic field interference from power transformers and a full-bottom no-slip pad provides plenty of stay-put and helps reduce electrical coupling from amplifier chassis hardware.

Radial Engineering JDI Duplex Features:

  • Stereo direct box for high output sources
  • Eclipse transformers for warm Bessel curve
  • Virtually zero distortion from 10Hz to 40kHz
  • Built to handle the extremes of concert touring

Radial Engineering JDI Duplex Specifications:

  • Circuit type: Passive transformer isolated
  • Dynamic range: 135dB
  • Signal to noise: 119dB
  • Frequency range: 10Hz to 40kHz
  • Linearity: 0.1dB - 20Hz to 20kHz
  • Phase coherence: 4º at 20Hz; 0º at 1kHz
  • Distorton: 0.006% @ 20kHz
  • CMR rejection: 100dB @ 60Hz
  • Input:
    • 4 x 1/4" jack (CH-1 & CH-2 In & Thru)
    • 4 x RCA(CH-1 & CH-2 In & Thru)
      (mono-merge function for L & R)
  • MERGE MIX function: Stereo to mono merge switch x 2
  • Input impedance: 140kHz
  • PAD: -15dB pad on input x 2
  • HI-CUT filter: 10kHz low pass switch x 2
  • Output: 2 x balanced XLR-M
  • Transformers: Eclipse ET-DB1, 12:1 ratio
  • Ground lift: LIFT switch - XLR outs pin-1
  • Construction: 14 gauge steel chassis and outer shell, baked enamel finish
  • Size (TX and RX)(WxDxH): 6.25" x 5.0" x 1.875" (159 x 127 x 48mm)
  • Weight: 2.9 lb (1.32 kg)

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