Description: Micro USB input interface: can be used to connect mobile phones. Aux input interface: can be used to connect LED TV, mobile phone and tablet. Optical fiber input interface: connecting devices with fiber output. Audio output interface: connect 2.0 passive speakers. SUB output interface: connect the active subwoofers. Specification: Channel: 2 Output power: 2x60W@4?, 2x45W@8? Size: 128*133*33mm Impedance: 4-8? Chipset: SA9023+CS8422+TAS5508C+SUB(NE5532)+TAS5342 Input interface: Micro USB, AUX, Optical, Coaxial Output interface: SUB (active bass line output), R/L (left and right speaker line output) Maximum sampling rate: USB24bit/97kHz Optical/Coaxial: 24bit/192kHz Distortion: 0.22% Signal to noise ratio: 98db Power Supply: DC 24V 4A Package Includes: 1 Piece HiFi Amplifier