bullhorn, loudspeaker, microphone, bully pulpit, soapbox, shout, bellowing, placard, boombox, clappers, walkie, nightstick, shrieking, thunders, horns, tannoy, pitchforks, protestor, yell, intercom, picket, voices, earpiece, lathi, wailing, sieg heil, cudgel, clenched fist, rallying cry, mouthpiece, mike, ghetto blaster, barricades, sloganeer, rath, claque, torches, battering ram, housetops, hammers, protesters, zindabad, petard, barker, claxon, slingshot, pulpit, tea bag, holler, marchers, kazoo, tape recorder, handclap, scream, din, tommyrot, foghorn, hosanna, mallet, counterdemonstration, sledgehammer, broom, bear hug, demonstrators, lym, teleprompter, heckle, demagogues, klaxon, ukulele, yawp, cherry picker, clout, hecklers, banner, clackers, bongo drum, bully, cuba libre, marching, mewling, scepter, taunt, bullyboy, hmph, honking, screechers, baldhead, dittohead, strum, tsks, noisemaking, fearmonger, jackanapes, catcall, bawler, wand, shaka, blow dryer, whistling, picketer, chorus, billboard, flashlight, raft, bellows, binoculars, derrick, torch, bathtub, bell, crane, lantern, parachute, refrigerator, switchboard, accordion, catapult, contraption, cradle, funnel

acoustic device