喊话器(英語:megaphone, loudhailer, bullhorn, blowhorn),又稱声音喇叭(英語:voice trumpet, speaking trumpet, hailing trumpet),粵語閩南語俗稱大聲公,是一种手持的号筒扬声器英语horn loudspeaker,用于扩大使用者的讲话声音,以使讲话内容被更远或更多的人听见。

喊话器可分为原声喊话器(英語:acoustic megaphone)和电力喊话器(英語:electric megaphone)。前者主体部分仅包含一个喇叭,完全依靠声学效应扩大声音。后者除了喇叭还包含收声的麦克风和扩音的电子设备。

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