Ключевые слова: alert, amp, amplification, amplifier, announce, announcement, audio, blue, broadcast, bunch, calling, column, communication, dirty, electric, emit, information, isolated, loud, loudspeaker, many, megaphone, new, old, outdoor, pa, pair, pillar, post, power, public, rusty, shout, sky, sound, sound system, speak, speaker, station, system, talk, tell, vintage, voice, volume, warning, wire,