Three projects achieved this. They all used suspended acoustic rafts 200mm below the CLT soffit rather than direct-applied treatment, keeping the timber visible while hitting 0.5s reverberation.
Thornbury PrimaryYour project · 2023
Kingsdale SchoolArchDaily · London
Holzbau PavilionDezeen · Zurich
Cited from
Project
Thornbury spec /3.4 — acoustic strategy
Web
ArchDaily — CLT school acoustics study
Standard
BB93 Table 1.2 — 0.6s max reverberation