Low noise: If the preceding stage has input noise, the power amplifier will cut it in microsecond.  nonoise jamming in the static state. The music is fluency. It is quiet and comfortable in the indoor. Good tone quality: Low Frequency is thick and solid, alto voice is luscious and resonant, high pitch is tenuous. Easily sing a song, entertainment in the room, and the music is durable and excellent. High efficiency: Up to 70% output of the overall efficiency: low temperature, energy conservation, low carbon and environmental protection. Soft protection: low block, constantly output the heat; make your entertainment stable operation. Small volume: 2U frame, short depth, which is feasible for putting in the cabinet, and saving the room. Beautiful construction: sound track of the right and left is symmetrical in the inner design, which is reasonable, meticulous. The Al. plate is top grade and artistic.