ZVOX 555 Low-Profile Single-Cabinet Surround Sound System with Optical and Coaxial Digital Inputs Dimensions; 28 "w x 14 1/2 "d x 3 3/8 "h Weight: 20 pounds. With box and packing: 23 pounds. Amplifier: The 555 uses a high-efficiency 70 watt Class D digital amplifier. Rear inputs: (2) analog stereo inputs, (1) optical (To slink) digital input, (1) coaxial digital input. Front input: (1) 3.5mm stereo front panel input.