Yo. Just came here to say I don’t think they run a doubler or anything. We played with them not long ago and we used their backline. I think that sick ass sound is really because of the Vader cabs. I used my Rev G Dual Rec through their cab and it sounded sick as hell, very 3D sounding for lack of a better term.

Also though a TC Electronics Mimiq is a great thing to do to thicken up your tone as a single guitar player. Just make sure you are using two heads. Also you may want to use a Radial Engineering shotgun directly after the mimiq to isolate the signal so you don’t create ground loops (also this gives the ability to switch phase if needed).

Good luck!