main feature
■ Use CMOS technology.
■ Input multiplexing.
■ 4 stereo inputs.
■ Optimally adaptable to different sound sources Enter gain.
■With loudness function, treble and bass control.
■ Volume control (1.25 dB per step).
■ Treble and bass controls.
■ Two speaker attenuators.
■ Two independent speaker equalization and volume control devices.
■ Independent mute function.
■ A program that can realize all functions through the serial I2C bus change.