Their website has recent gear archives of the equipment used to record their albums. Just pay a visit to
www.opeth.com. The live setup is different, though. I believe in Europe, they play Laney heads. When I saw them last month in California, it was Marshall JCM 800 series heads,
Marshall cabs, Boss GT-5 (or maybe 6?) multi-effects. I didn't see rack gear, but it may have been located to the side or rear of the stage. Guitars used live were PRS models (24 fret, not sure of the specific model). Both Mikael and Peter played them.