A sound system is a combination of AUDIO components used to produce sound. The most common components are STEREO (6 letters), ACOUSTICS (9 letters), AUDIO (5 letters), HiFi (4 letters) and Dolby (5 letters). STEREO refers to the two-channel AUDIO system that produces sound from two speakers, while ACOUSTICS is the study of sound and its properties. AUDIO is the electronic signal that is used to create sound, and HiFi is a type of AUDIO system that produces high-fidelity sound. Dolby is a type of AUDIO technology that is used to improve the sound quality of AUDIO recordings.