3D sound effects can make sounds sound with different spatial characteristics, such as halls, opera houses, cinemas, caves, stadiums, etc., allowing users to experience a more realistic audio-visual experience when playing audio and video files. 3D sound effects mainly make the listener feel as if they are in a different environment by processing sounds such as environmental filtering, environmental shifting, environmental reflection, and environmental transition. The equalizer (EQ) is an electronic circuit that can adjust various frequency components separately. Signal amplification electronic equipment compensates for defects in speakers and sound fields by adjusting various frequencies of signals, compensating and modifying various sound sources and other special effects. Generally speaking, the sound frequency that people can hear is 20Hz-20KHz. Simply put, EQ divides this range into many frequency bands, and then adds additional amplification or attenuation to these frequency bands to obtain a sound effect that is more suitable for listening needs.