noun
soundproofing quality; sound insulating properties
Refers to the degree or property of blocking or absorbing sound, often used in technical or product descriptions.
この壁は防音性が高いので、隣の部屋の音が聞こえにくい。
This wall has high soundproofing quality, so it's hard to hear sounds from the next room.
防音性を重視して、窓に二重ガラスを選んだ。
I chose double-glazed windows, prioritizing sound insulation.
遮音性 emphasizes blocking sound transmission, whereas 防音性 is a broader term that can include both blocking and absorbing sound.
Compound of 防音 (soundproofing) + 性 (property, nature).