Since 1995, Siepen has been an endorser of
Mesa/Boogie amplifiers, using various
Triple Rectifier heads and multiple preamps. As of 2010, his main rack consisted of a Triple Rectifier "Recto Reborn" head, with a
Fractal Audio Axe-FX II providing effects. He uses two Sennheiser wireless units, one as a backup, and his old two-channel Rectifier as a backup. When doing overseas shows, he solely uses an Axe-FX II. Previous versions of his rack featured the two-channel Triple Rectifier as his main amplifier, a Rocktron Intelliflex instead of the Fractal for effects, and either a Mesa/Boogie TriAxis preamp or Rectifier Recording Preamp instead of his two-channel Triple Rectifier as a backup. For guitars, Siepen has made most use of
Gibson and
ESP Guitars, with Gibson being his preferred brand nowadays. Up until the late '90s, Siepen mostly used ESP guitars with Blind Guardian co-guitarist
André Olbrich, both guitarists making use of custom-made Horizon and Mirage guitars, although Siepen has been seen using other shapes, such as a custom-built model based on the
Jackson Randy Rhoads. He can sometimes be seen with a custom
ESP Eclipse, but he does not use this model often. His current main guitars, since then, have been several Gibsons, mostly Les Paul models, his main two being a Les Paul Custom and a Les Paul Standard Premium Plus. Most of his guitars, including the previously two mentioned models, feature dual
EMG 81 pickups, Suhr Doug Aldrich pickups, and TonePros hardware. == References ==