A new member of the vaunted Reference Series, the SM-11S1 stereo power amplifier displays all the sonic benefits formerly associated only with "cost no object" components. Using entirely new as well as traditional technologies, the SM-11S1's stellar performance begins with an ability to "double down" in power output into low impedance loads. Housed in the striking Reference chassis, the SM-11S1 expands the Marantz "high performance/high style" tradition. Marantz. Nothing less is good enough.