How about the second-hand stereo in Huaqing Village?

Huaqing Village second-hand audio can be

Huaqing Village, the second-hand market, there is the largest second-hand audio market in Xi'an City

Audio broadly speaking refers to a use of the electronic circuit design of the audio and electronic signals between the conversion of each other's equipment, but in the general colloquial audio usually refers to a complete set of audio signals that can be played to restore the equipment.

Audio equipment includes amplifiers, peripherals, speakers, mixing consoles and so on. The history of audio technology can be divided into four stages: electronic tube, transistor, integrated circuit, field effect tube

The development of audio technology can be divided into four stages: electronic tube, transistor, integrated circuit, field effect tube