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Radial Workhorse

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500 series 8 slot rack with 8x2 summing mixer


-Bulletproof design is backwards compatible

-Plenty of current for power hungry modules

-Dual output headphone buss for monitoring


The Radial Workhorse is a modular rack and mixer that combines the popular 500 series platform with an incredibly flexible patching system to let you create the ultimate studio environment.

Equipped to handle up to eight modules, the Workhorse lets you mix and match preamps, EQs and compressors and bring them all together in one rack. Individual modules may be accessed on the rear panel following the traditional API™ format or bussed to the built-in 8x2 summing mixer for left-right signal panning, level control and muting. Once mounted, a unique 'feed' functon lets you configure modules to feed one another in series to create the channel strip of your dreams!

The master section features a traditional virtual ground mix buss combined with the superb sonic performance of Jensen Transformers on the main mix outs. A separate stereo monitor output provides playback, plus a super-loud dual-output headphone amp lets the engineer share the mix with the artist. Multiple Workhorses may be ganged together using the expansion buss to build 16, 24 or even 32 channel systems.

Rear panel connectivity is extensive: Each channel is equipped with traditional XLR input and output. This is augmented with ?" TRS jacks for balanced or unbalanced connectivity. A special Omniport™ jack delivers module-specific functionality that can range from an extra output, ducking input or effects insert depending on the module design. The Workhorse comes ProTools™-ready with 8-channel D-subs for the inputs and outputs plus third D-Sub gives you access to the built-in summing mixer for those that prefer the added warmth of analogue summing. Powering concerns are addressed with a unique 'pooled' supply that shares 1200 milliamps of current between the available 8 slots. This allows high current demand modules to exceed the usual limitations of other 500 series racks without the worry of brown outs.

Plug and play easy to use, the Workhorse brings the fun, excitement and creative advantage of warm-sounding analogue to the modern \ digital studio.


Specifications are subject to change without notice.
Circuit type: Connection buss from modules to connectors
Max output level: +22dB (20Hz to 20kHz)
Voltage Gain: Up to +23dB on the main output
Distortion: 0.007% @ 1kHz with 10dB in and 10dB out 0.05% @ 20Hz with 10dB in and 10dB out
Crosstalk: -65dB
Signal to Noise: -91dB with +20dB output
Card Slot Inputs: Eight balanced XLR, ¼" TRS, D-SUB
Card Slot Outputs: Eight balanced XLR, ¼" TRS, D-SUB
Card Slot Impedance: Depends on modules used
Internal Mix Buss: 4.75k Ohms input coupling resister
Summing Mixer Input: DB-25, Unbalanced +4dB/-10dB with up to +20dB capacity; input impedance = 4.75K Ohms
Main Output: Balanced stereo output; XLR, ¼" TRS; Jensen™ transformer isolated; +4dB (to +22dB)
Main Inserts: ¼" TRS - tip = send; ring = return
Monitor Output: Balanced stereo output; XLR, ¼" TRS; transformerless; +4dB balanced (to +22dB)
Connector Wiring: XLR: pin-1 ground, pin-2 (+), Pin-3 (-); TRS ¼": tip (+), ring (-), sleeve ground
Headphone Out: ¼" TRS Stereo - 2.8VRMS @ 8 Ohms (up to 7VRMS depending on headphone impedance)
Ground: Red: audio, Black: chassis
Power Supply Input: 100V - 240V AC with 48V Phantom
Power Supply Output: 1200mA - External switching type with 5-pin XLR, 48V phantom;
Dimensions: 19" wide x 5.25" tall x 7.44" deep 482.6 wide x 134 tall x 189mm deep
Weight: 22lbs / 10kg
Conditions: For use in dry locations only between 5°C and 40°C
Warranty:  Radial 3-year, transferable


It's hard to imagine squeezing any more functinoality into a 3U device like this, and Radial is to be congratulated for putting plenty of thought and design smarts into such a compact and attractive package.

Audio Media

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"The Workhorse is a more sophisticated, more capable, and more costly re-thinking of what a 500-series rack frame should be."

Electronic Musician

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"When Radial announced that it was working on a 500-Series it generated much interest.... the Workhorse will be an excellent addition to any studio and is the perfect choice for bringing analogue processing to a DAW-based studio.."


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"Every knob and button is smooth, yet firm, the circuit boards are thick, clean and neatly laid out, and the inputs and outputs are of the highest quality. In other words—it more than lives up to Radial's reputation for roadworthy toughness….Most 500-Series enclosures are simple, utilitarian boxes that offer a single XLR input and output per slot. In contrast, The Workhorse offers a host of choices to fit most every hookup and patchbay situation."


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"Radial Engineering seems to like solving pro audio problems…So when I heard that Radial was building a 500-series rack, I was curious, because I assumed this rack would be overbuilt, well though out and versatile. I was right. The damn think looks like you could drop it off a truck and it would survive, but there's a lot more to it than that..

Tape Op

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"The Radial Workhorse is one of the most versatile and well-equipped racks I've ever tried, and exudes the typical Radial Engineering detail and thoughtfulness…if you are thinking of embarking down the 500-series road, the Workhorse rack has to feature very highly on the list of contenders..."

Sound on Sound

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"Despite having a comparable boatload of features, operating the Workhorse is designed to be simple and intuitive…I ultimately tried every connection and function the Workhorse offered and found it all worked as promised…the big question is whether this Radial mixer is worth its premium price. I believe it is. It is truly professional grade and worth the cost for its applications in location recording, DAW output summing, tracking with parallel compression and other flexibilities…"

Pro Audio Review

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"Radial is expert at eliminating hum and noise from guitar signals, and in the Workhorse that knowledge has been put to good use…The Workhorse certainly makes a terrific host for modules – sturdily built with useful routing features and extensive connectivity…Whichever 500 Series modules you use the Workhorse makes a great home for them."


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