The Pro(TM) bass series features Class A/B power amplifiers with patented SmartRail(TM) and DDT(TM). This technology gives these amps massive dynamic power in a lightweight package, without introducing any switching distortion or delay. Each amp features your choice of operating in Stereo, Mono, Biamp or Full Range/Sub mode. But that's not all. You can easily control the Post-EQ stereo effects loop as well as the input mute, with blinking light via the included footswitch. Wrap all this up with the confidence of a product made in the USA, a complete package weighing only 25 pounds and the Peavey reputation for quality, and you couldn't ask for anything else.