quad ‧ ra ‧ phon ‧ ic BrE AmE , quadrophonic /ˌkwɒdrəˈfɒnɪk◂ $ ˌkwɑːdrəˈfɑː-/ adjective
using a system of sound recording, broadcasting etc in which sound comes from four different ↑ speaker s at the same time ⇨ mono , stereo
quad ‧ ra ‧ phon ‧ ic BrE AmE , quadrophonic /ˌkwɒdrəˈfɒnɪk◂ $ ˌkwɑːdrəˈfɑː-/ adjective
using a system of sound recording, broadcasting etc in which sound comes from four different ↑ speaker s at the same time ⇨ mono , stereo
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012