为何 STI（语音传输指数）比混响时间更为关键，以及板条木质系统如何在无需扩声的音乐厅中平衡音色的温暖感与清晰度。

Reverberation time has been the dominant metric for hall acoustics for over a century — but for spoken word performance, Speech Transmission Index (STI) tells a more honest story.

In our recent retrofit of the National Opera House, we paired curved slatted oak panels with perforated rear walls to bring STI from 0.48 to 0.74 without dampening the orchestral warmth singers depend on.

The key is targeted absorption in the 250–500 Hz band — where speech consonants live — while preserving reflections in the 2–4 kHz vocal formant region.