Date Introduced: 1993 Weight: 110lbs Dimensions: 8.5"Hx19"Wx21"D Description: Solid-state stereo power amplifier with "Sustained Plateau" output-stage biasing. Power output: 200Wpc into 8 ohms, 400Wpc into 4 ohms, 800Wpc into 2 ohms, 1600Wpc into 1 ohm, one channel driven (all power outputs equivalent to 23dBW). Damping factor: 80. THD: 0.1% at 1kHz, 0.2–0.5% at 20kHz, at full power Excerpt from S-Series Amplifier Brochure: Evolution in Engineering: Sustained Plateau Bias Concern for the environmental impact of high power amplifiers in and out of the listening room, combined with a desire to deliver more Class A power, has inspired the development of an important new technology: Sustained Plateau Bias. Developed initially for our Audio Standard monaural amplifier, this patent-pending system contains the control and logic circuitry that insures Class A operation of the amplifier while reducing overall power consumption and heat.