4:42 into this video explaining the guitars and amps Flea uses, his tech explains: "Those are Gallien-Krueger 2001 RB. He is using 3 of them. Pretty much one controls the whole thing and feeds two others."
The newest bassist of Slipknot, Alessandro "Alex" "V-Man" Venturella posted this photo on his official instagram of his rig. The bottom 3 racks are all Gallien Krueger heads and the bottom two are Gallien-Krueger 2001RB Bass Heads.
"Specifically, my new full-stage rig is a GK Fusion 550, a GK 2001RB (power amp only), and two GK Neo 4×12 cabinets," Bryan Beller says, on his [website](http://www.bryanbeller.com/wordpress/2011/07/my-endorsement-of-gallien-krueger-amps-cabs-a-bass-geek-mega-blog/).
Tim talks about his gear in [this interview](http://pinoysijerome.blogspot.dk/2007/07/bass-guitar-gear-of-tim-foreman.html). He says, "I use a Gallien-Krueger 2001RB head as a power amp for a Line 6 Bass POD."
I went to the gallien kreuger website and the rb series of amp heads looked closest to what she was using in that picture and when I counted the knobs it has the 2001 matched up closest to the other two in the rb series
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