Radial ProDI (R800 1100) Passive Direct Box

Passive direct box

5.0 out of 5 stars

What's in the box:

  • Radial Engineering ProDI - Single Channel Passive Direct Box
  • Three (3) Year Transferable Warranty

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Item Number 
Vendor Part
R800 1100

Superior to Any Other DI in this Price Range!

The Radial Pro DI is a high-quality, full-range passive mono direct box equipped with custom made audio transformers for exceptional signal handling without saturation and with extremely low phase distortion in the critical bass and mid regions. The result is exceptional clarity and definition at an attractive price point. You will find that with acoustic guitars and basses, the natural tone of the instrument will shine through with a smooth and musical rendering. For electrically powered devices such as keyboards, the ProDI will immediately eliminate troublesome ground loops while delivering solid dynamics with a full rich sound.


  • Full range passive direct boxes
  • Isolation transformer eliminates noise
  • Very low harmonic and phase distortion
  • Compact and rugged design
  • Ideal for live sound and studio

Specifications for the Radial ProDI

{ "Audio circuit type:" : "Passive, transformer based", "Transformer:" : "Eclipse ET-DB2, 12:1 ratio", "Number of channels:" : "Single channel (mono)", "Frequency response:" : "20Hz ~ 18.5KHz (± 0.2dB) ", "Dynamic range:" : "128dB ", "Total harmonic distortion:" : "0.01% from 20Hz~20kHz @-10dB", "Phase Deviation:" : "1° @ 100Hz; 8° @ 20Hz ", "Input Impedance:" : "140k Ohms, unbalanced ", "Output Impedance:" : "150 Ohms, balanced ", "Maximum Input:" : "+18dB @ 20Hz ", "Features" : { "Input pad, Ground lift" : "", "Input Connectors:" : "1/4" in & thru", "Output Connectors:" : "XLR-M out" }, "General" : { "Construction:" : "14 gauge steel chassis & outer shell", "Size (L x W x D):" : " 4.25” x 2.75” x 1.75" (108 x 70 x 44mm)", "Weight:" : "1.2lb (0.54kg)", "Shipping size (L x W x D):" : "6.5" x 4" x 3" (165 x 76 x 102mm)", "Shipping weight:" : "1.35lb (0.61kg)", "Power:" : "Passive, no power required ", "Conditions:" : "For use in dry locations only between 5°C and 40°C" } }

Research Materials for Radial Engineering ProDI (RAD-PRODI)

We've added technical materials to help with your buying decision. Even if you're technically inclined, you may want to consider talking to our sales techs to make sure this item is the right fit for your particular use. 800.562.6006

ProDI (RAD-PRODI) Brochure

ProDI (RAD-PRODI) User Guide

Read 1 review for the ProDI Passive Direct Box

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R. White
We use several of these and the ease of set up and push button control of the lift make it easy to eliminate noise issues.