The Tour(TM) series features class A/B power amplifiers with patented SmartRail(TM) and DDT(TM) technologies.This tecnology gives these amps massive dynamic power in a lightweight package, without introducing any switching distortion or delay. Each amp features DC protection, an efficient parallel cooling system and a two-speed cooling fan. But that's not all. These amps contain a Kosmos B Subharmonic Generator which allows the user to synthesize a note one full octave below the note you are playing. Wrap all this up with a constant Q, 9-band, graphic equalizer and the Peavey reputation for quality, and you couldn't ask for anything else.