Threshold Model SA12e Pure Class A Monoblocks Amplifiers. Very rare flawless condition with service manual and shipping creates Description: Class-A monoblock power amplifier. Power output: 250Wpc (24dBW) continuous, 500W peak into 8 ohms (resistive or reactive) from 20Hz-20kHz at no more than 0.1% THD. Power bandwidth: DC to 100kHz. Slew rate: 50V/us. Output current capability: 70A continuous (200A peak). Input impedance: 50k ohms unbalanced, 600 ohms balanced. Noise: minimum -100dB, unweighted, against rated output. Dimensions: 19 W by 8.72 H by 27.75 D. Weight: 130 lbs. Price: $14,400/pair (1990); no longer available (2007). Manufacturer: Threshold Corporation, Auburn, CA (1987); Threshold Audio, Inc.