ESS Technology Inc. (1984) was founded in California, USA. The founder of the company applied his scientific and technological inventions of audio compression and reconstruction to electronic audio books and greeting cards.

A sound system usually includes:

1, sound source equipment (DVD, CD, MP3, MP4, computer, mobile phone, microphone and other sound source output equipment).

2. Audio signal dynamic processing equipment (voltage limiter, effector, mixer, audio processor, equalizer and other audio signal processing equipment).

3. Audio signal amplification equipment (analog power amplifier and pre-stage power amplifier, post-stage power amplifier, digital power amplifier and other equipment).

4. Sound reproduction equipment (full range speakers, ceiling speakers, pillars, linear array speakers, array speakers, tweeters, subwoofers, etc.). ).

Specifically, it includes power amplifier, peripheral equipment (including voltage limiter, effector, equalizer, exciter, etc. ), speakers (speakers, speakers), mixers, audio sources (such as microphones, musical instruments, VCD, DVD) display devices, and so on. Among them, speakers are sound output devices, sound boxes, subwoofers and so on. A speaker includes three kinds of speakers, high, low and medium, three but not necessarily three.