Ключевые слова: alert, amplifier, announce, announcement, attention, audio, background, broadcast, broadcasting, bullhorn, business, communication, concept, conceptual, concert, design, dirty, equipment, horn, icon, isolated, loud, loudspeaker, marketing, megaphone, message, metal, music, object, old, power, retro, shout, shouting, sign, sound, soundsystem, speak, speaker, speech, symbol, system, technology, tell, vintage, voice, volume, warning,