BLAUPUNKT 4/2/1 CHANNEL POWER AMPLIFIER EMA 455 600 WATTS. Fully operational. 640 watt 4 channel amplifier, 4 x 55 watts RMS or 4 x 110 watts Peak power, 2 x 165 watts RMS or 2 x 320 watts Peak power, includes on-board adjustable low pass crossover and fixed high pass crossover, up to +12db of bass boost at 45 Hz, accepts RCA line level and high level (speaker) inputs, dimensions 7.25-Inch x 2.1-Inch x 11.7 Features & details Multi-channel amplifier 640 watts Peak power, 320 watts RMS Attractive brushed aluminum heat sink Product information Product Dimensions: 9.1 x 13.85 x 3.62 inches Item Weight 4.23 poundsASINB0064N6DOY Item model number: 1 051 110 340 001 Discontinued By Manufacturer: Yes PLEASE SEE ALL PHOTOS FIR BEST DETAIL.