拡声器

1. Origins, structure, and basic meaning

• Structure: 拡声器, read かくせいき, is a noun for a megaphone or loudspeaker used to project sound.
• Basic usage: 拡声器で知らせる treats it as the means of making an announcement; 拡声器を置く treats the device itself as the object placed.

2. Common pitfalls and similar expressions

• A device for projecting the voice
  • 拡声器 amplifies and projects a voice across a wider area. The focus is the output function, not merely a microphone that captures sound.