"The Workhorse has quickly become one of my essentials at Slack Key Studio. Once again, Radial knocked the ball out of the park for me! "

~ Randy Kohrs
Producer, Country Artist

» click for more


     "The Workhorse totally blows my mind! I can get unheard of tones and combinations with all of my 500 series units that before were not possible. "

~ Neil Zaza
Solo Recording Artist
Back button
» Workhorse home
» Features
» Development
» Using & Applications
» Specifications
» FAQ


   Workhorse at MESSE
» User Guide
» Smart Sheet
» Reviews
» Photos
» Workhorse Open
    Source Document


500 Series Modules
» PowerPre
» JDV-Pre
» JDX
» X-Amp
» EXTC
» PhazeQ
» Komit
» Shuttle
» Tank Driver

» Back to Workhorse
» Authorized Dealers
Radial home klinkSite map linkContact link
This Image shows the front and rear panel of the Workhorse. Click here to see a full description of the feature set.

"Radial worked hard to bring more to the party and expand the standard. A good case for 500 Series users to move to
the Workhorse."
~ George Shilling (Resolution Magazine)

Featured Video
Joe Chiccarelli explains recording guitar with the Workhorse
500 series frame and mixer.
Radial Workhorse™

  • Eight slot rack with 8x2 summing mixer
  • 100% compatible with API 500 series
  • Extra current for power hungry modules
  • Jensen transformer isolated outputs

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 ¼" 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.



Workhorse works with both current and older 500 series modules and meets the VPR Alliance printed specification.
Watch the video
Now available: rack-only Workhorse. The 8x2 summing mixer may be added later as a user installed retrofit.
Workhorse™ Applications
Live Recording
The Workhorse is easily arranged to create an 8 channel recording system. Add 8 PowerPre mic preamps and you are set to go! Use the expansion slot for 16, 24 or even 32 channels.

(click on images to view larger)
Flexible Channel Strip
The Workhorse is ideally suited to create the optimal channel strip. Combine your favorite preamp with an EQ and compressor and send the signal to your recorder and the headphones at the same time.
Recording and Reamping
The Workhorse is an awesome tool that lets you record the instrument with a preamp and then use the Radial X-Amp and EXTC for Reamping(TM) signals back out to effects and guitar amplifiers.