As of 0:10 in this video, Devin Townsend of Vai, Front Line Assembly, The Wild Hearts, and Strapping Young Lad, talks about his effect units and other equipment, and the JD7 is located in the bottom rack.

The Source URL is a rig rundown by PremierGuitar Magazine. PG caught up with current guitarist Tommy Thayer, along with techs Francis and Michael Berger, to dig into all the axes (in some cases, literally), effects, and amps that the band brought out on their 2014 tour with Def Leppard.

"The thunder starts with a Shure U4D-UHF into a Radial JD-7 Injector."

Adam is using 2 of these in the rack during the innocence + experience tour.

In this Instagram post showcasing Fredrik Thordendal’s rack, a Radial JD7 switching unit can be seen at the very top of the rack.

Used for testing the guitar through multiple different amplifiers.

On Radial's website, Waters was mentioned as a user of this signal distribution system.

On Radial's website, Scott is mentioned as user of the Radial JD7 signal distrubution system.

According to Radial's website, Bachman is a user of Radial JD7 System.

Darryl runs a 2 channel Shure wireless to Rocktron Patchmate switcher to a Radial JD7 Injector, which splits the signal to an early 70’s Ampeg SVT head through a pair of Ampeg SVT 810 Classic cabinets, and also to a pair of Ashly BP41 preamps (one for J bass, one for P bass) to the Meyer crossovers, to 3 Crown amps then to the pair of Meyer tri-amped speaker cabinets. Each of the two Meyer speakers consist of 2×15, 1×12, and a horn.

"The Radial JD7 made my guitar sounds so much thicker and punchier. I think the Drag feature should be built into everything ever made!" - Walker about Radial JD7.

Before we bought the Radial JD7, each time I added an amp the impedance changed, the level dropped and it messed with my tone. With it, I can run as many amps as I like and it keeps my tone true. I use it in the studio and with my live rig. The Radial JD7 is phenomenal.

source: http://rockguitardaily.blogspot.de/2013/05/monster-truck-furiosity-in-conversation.html

"We have a Radial JD7 (guitar splitter) which is a great little tool for outputting to multiple amps at the same time."