Radial Engineering
ProDI Passive Direct Box

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Item: N12-1411

Availability: In stock

ProDI Passive Direct Box
ProDI Passive Direct Box ProDI Passive Direct Box ProDI Passive Direct Box ProDI Passive Direct Box


The Radial ProDI Passive Direct Box is a high-quality, passive direct box that employs a proprietary transformer for both impedance conversion and isolation. Linear from 20Hz-18kHz, with low distortion and virtually zero phase distortion makes it perfect for live or studio performances. Because of the transformer isolation, problems such as hum and buzz caused by ground loops are eliminated, making it very easy and hassle-free to use. The Radial ProDI features 1/4" thru/input, -15dB pad, and ground lift protected from damage by a protective front panel. Heavy-duty construction, baked enamel finish, and 600-ohm balanced output. 2-1/2" x 4-1/4".


  • Passive direct box
  • Proprietary transformer for impedance conversion and isolation
  • Linear from 20Hz-18kHz
  • Low distortion and zero phase distortion
  • XLR input
  • 1/4" thru/input
  • -15dB pad
  • Ground lift
  • Protective front panel
  • Heavy-duty construction
  • Baked enamel finish
  • 600 ohm balanced output
  • 2-1/2" x 4-1/4"

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  • Frequency Response:  20Hz to 20kHz (+/-2.5dB)
  • Harmonic distortion:  0.01% (20Hz to 20kHz)
  • Phase distortion:  1 degree at 1Khz / 8 degrees at 20Hz
  • Common mode rejection:  -90dB @ 60Hz
  • Input impedance:  140kOhms
  • Output impedance:  600 Ohms
  • Input pad:  -15dB
  • Size (W x H x D):  2.75” x 4.25” x 1.75" / 70mm x 108mm x 44mm
  • Weight:  1.2lbs / .54kg
  • Construction:  14-gauge steel chassis & shell, baked enamel finish
  • Warranty:  3 year limited warranty

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