Ключевые слова: address, advertisement, amplifier, announce, announcement, attention, audio, background, blue, broadcast, broadcasting, bullhorn, call, communication, concept, conceptual, device, director, electric, electronic, event, horn, isolated, loud, loudspeaker, megaphone, message, metaphor, news, object, police, power, powerful, protest, public, red, retro, sky, sound, speak, speaker, speech, system, trumpet, vintage, voice, volume, warning, white, yell,