sound system

noun

any system of sounds, as in the speech of a language

integrated equipment for producing amplified sound, as in a hi-fi or a mobile disco, or as a public-address system on stage

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for sound system

Historical Examples of sound system

Furthermore, our alphabet has not only not increased in proportion to our sound-system, but it has decreased.
A Handbook of the English Language
Robert Gordon Latham