Ключевые слова: address, amplification, amplifier, announce, announcement, attention, audio, background, blue, broadcast, broadcasting, bullhorn, communicate, communication, concept, electric, electronic, horn, inform, information, loud, loudspeaker, megaphone, message, noise, object, outdoor, pole, post, power, protrude, public, public speaker, retro, shout, siren, sky, sound, speak, speaker, speech, station, system, technology, tumultuous, vintage, voice, volume, warning, white,