拡かく声せい

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Meanings

1

noun, noun or participle which takes 'suru', transitive verb

voice amplification; sound amplification

Refers to making a voice or sound louder, often using a device. Commonly used in compounds like 拡声器 (loudspeaker).

拡かく声せい器き
拡声器 is the device (loudspeaker/megaphone), while 拡声 is the action or concept of amplification.

Compound of 拡 (broaden, expand) and 声 (voice). The exact historical derivation is uncertain, but the meaning is transparent from the kanji.