Radial Engineering ProD8 8-Channel Rackmount Passive Direct Box

SKU: RAR8001120 MFR: R800 1120
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Key Features

  • Achieve pristine sound quality with this Radial Engineering 8-channel direct box.
  • Enjoy versatile connectivity with 1/4" inputs and XLR outputs on every channel.
  • The ProD8's passive design ensures low noise and eliminates the need for external power.
  • Rugged 14-gauge steel construction guarantees durability for studio and stage use.
  • Easily solve ground loop issues with the convenient ground lift switch on each channel.
  • Experience exceptional value with this rackmount DI box, perfect for any pro audio setup.
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Temporarily On Backorder?Expected Availability: 10/2025
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Radial Engineering ProD8 Specifications

  • Material

    14 gauge steel chassis & outer shell

  • Conditions

    For use in dry locations only between 42 Degree F and 104 Degree F (5 Degree C and 40 Degree C)

  • Audio circuit type

    Passive, transformer based

  • Transformer

    Eclipse ET-DB2, 12:1 ratio

  • Number of channels

    8

  • Frequency response

    20Hz - 18.5KHz ( +/- 0.2dB)

  • Dynamic range

    128dB

  • Total harmonic distortion

    0.01% from 20Hz-20kHz @-10dB

  • Phase Deviation

    1 Degree @ 100Hz; 8 Degree @ 20Hz

  • Impedance

    Input: 140k Ohms, unbalanced
    Output: 150 Ohms, balanced

  • Maximum Input

    +18dB @ 20Hz

  • Feature

    Input pad, 180 Degree polarity reverse, Ground lift

  • Connectors

    Input: 1/4"
    Output: XLR

  • Power

    Passive, no power required

  • Dimensions (L x W x H)

    19 x 6.25 x 1.75" (48.3 x 15.87 x 4.45cm)

  • Weight

    7.2 lbs (3.26kg)

  • UPC Code

    676101036790

About Radial Engineering ProD8

Passive 8-Channel Rackmount Direct Box
The ProD8 is a high performance 8-channel passive direct box optimized for keyboard rigs in professional touring, with redundant 1/4" inputs for each channel and a completely passive design that requires no power to operate.

Professional performance
The ProD8 features up to 8 direct box outputs in a single 1RU rack space for professional touring, with dual 1/4" inputs on each channel to incorporate a backup system or connect up to 16 channels of audio at once. A 1/4" TRS effects insert jack on each channel allows for connection to various effects devices while adding greater routing options, while a thru-put jack delivers a direct feed to the artist's playback system. The front panel features isolated XLRs for balanced low-noise outputs, each equipped with ground lift and 180 Degree polarity reverse switches.

Transformer driven for greater headroom & low noise
The engine inside the ProD8 is a custom wound Eclipse ET-DB2 transformer that performs both the impedance matching and balancing. Linear from 20Hz to 20kHz, it is able to withstand the extreme dynamics common with today's digital keyboards. Unlike active circuits that overload and square wave when the rail voltage is exceeded, transformers saturate. This means that as the signal increases, the ProD8 naturally rounds out the tone producing a warm Bessel curve reminiscent of the very best vintage audio gear. The other significant advantage to this passive design is 100% galvanic isolation between the source and destination, which eliminates hum and buzz caused by ground loops.

Adaptable Configuration
To enhance setup options, the Radial ProD8 is equipped with reversible rack ears. This handy feature allows the system tech to position the inputs on the front of the rack when interfacing with external keyboards or have them inside if the setup is predominantly equipped with rack modules.

ProD8 Applications

The ProD8 in the Studio
Set the ProD8 rack ears so that the 1/4 inputs are on the front panel to make patching different instruments easy. This give you access to the dual inputs and thru-put jacks for quick connection to amps in the studio.

The ProD8 with Rack Synths
Set the ProD8 up with the XLR outputs facing front to accommodate touring racks of modular synths. With the 1/4 inputs on the inside of the rack your synths stay connected while sound techs patch the XLR outs into the main snake and PA system.

Using the ProD8 for Backing Tracks
The ProD8's dual summed inputs make it convenient for patching two sources into each channel at the same time. This lets you use the ProD8 for backing tracks with two multi-track running in sync or redundant keyboard setups for live performances.

Radial Engineering ProD8 Features

  • High density 8-channel rackmount DI for keyboards
  • Reversible rack ears to optimize patching setup
  • Withstands extreme dynamics from high-output sources
  • Redundant inputs let you incorporate a backup system
  • In-A/In-B: Dual 1/4" inputs on each channel with stereo to mono summing for extra keyboards or backup system
  • Thru: 1/4" thru-put is used to feed the summed output from A or B inputs on each channel to the stage monitor
  • Loop: 1/4" TRS insert loop for each channel, works like an insert on a mixing board with tip-send, ring-receive
  • -15dB Pad: Reduces input level for ulta-hot signals such as CD players

Warranty Information

This product has a limited warranty of 36 months.

Key Features

  • Achieve pristine sound quality with this Radial Engineering 8-channel direct box.
  • Enjoy versatile connectivity with 1/4" inputs and XLR outputs on every channel.
  • The ProD8's passive design ensures low noise and eliminates the need for external power.
  • Rugged 14-gauge steel construction guarantees durability for studio and stage use.
  • Easily solve ground loop issues with the convenient ground lift switch on each channel.
  • Experience exceptional value with this rackmount DI box, perfect for any pro audio setup.

What's in the box:

  • Radial Engineering ProD8 8-Channel Rackmount Passive Direct Box
  • Radial Engineering 3 Year Limited Warranty