Project Challenge
This key university’s multi-purpose academic lecture hall hosts academic reports, keynote speeches, seminars and small performances. The large-volume masonry structure suffers from severe mid-low frequency reverberation. Speech sounds muddy and uneven across seating areas, and audiences in the rear rows struggle to hear content clearly. Conventional porous acoustic materials cannot effectively resolve the stubborn 250Hz–1000Hz low-frequency standing waves that dominate large educational venues. The university required a professional acoustic upgrade that meets educational building acoustic standards and maintains a solemn, elegant architectural style.
Solution
A combined system of grooved and perforated resonant acoustic panels was installed on the side and rear walls of the lecture hall. Engineered on the Helmholtz resonance principle, the precision slot-and-hole structure specifically targets stubborn mid-low frequency standing waves that porous panels cannot eliminate. Paired with rear air cavities and mineral wool backing, the system achieves an overall NRC of 0.90 for balanced full-band sound absorption. Light wood veneer finishes match the solemn, formal architectural style of the campus academic building.
Results
Post-renovation acoustic testing confirmed that the hall’s reverberation time falls within the optimal range for academic speech and small performances. Speech intelligibility improved significantly, with uniform sound quality across all seating zones. The venue now fully supports diverse activities including academic lectures, academic conferences and cultural performances, and passed the educational building acoustic acceptance standard with excellent results.
