Nobsound A4 HiFi Bluetooth 5.0 Tube Amplifier COAX/OPT Integrated Audio Amp USB Player 200W

Features With 5 kinds of analog and digital audio input (Bluetooth 5.0 / USB / Coaxial / Optical / 2 groups of RCA), compatible with almost all audio devices such as MP3, phone, tablet, computer, CD players etc. to meet different needs of home audio systems. U-disk input supports lossless formats such as APE, FLAC, WAV etc., easy to enjoy HiFi music. High-quality components are used to ensure better sound quality, and besides speaker output, a low frequency output is specially designed to connect active subwoofer to build 2.1 channel audio system and strengthen bass sound effects. With treble and bass control to bring more delicate sound according to your own listening style. Combined design of vacuum tubes and transistors, the sound is clear, warm, smooth and delicate with high fidelity. And using 4PCS Toshiba 5200 and 4PCS 1943 transistors for power amplification, three transformers is added that can stably output max 200W in each channel, easily to drive all home passive spe