... to selection:pink,black,red,white,etc. Specifications: Output Power: 20W Frequency Response: 100HZ ~ 13,000 HZ + 1db Consumption ... of an exterior alternating current, or AC power source, collecting the power from an ordinary wall outlet and storing it ... . Performance MeasurementsThe best amplifiers perform to precise frequency, distortion and power measurements. Audio enthusiasts look for the flatness ...