The Effect of Design Decisions on Acoustic Quality in Museum Environments

Contemporary museums’ architecture often emphasizes visual aesthetics—large volumes, open‐plan layouts, and highly reflective finishes—resulting in acoustic challenges such as excessive reverberation, poor speech intelligibility, elevated background noise, and reduced privacy. This study quantifies the impact of surface‐specific absorption treatments on acoustic metrics across eight gallery spaces. Room impulse responses calibrated virtual models, which simulated nine absorption scenarios (low, medium, high on ceilings, floors, and walls) and evaluated reverberation time (T20), speech transmission index (STI), clarity (C50), distraction distance (rD), Spatial Decay Rate of Speech (D2,S), and Speech Level at 4m (Lp,A,S,4m). Results indicate that going from concrete to a wood floor yields the most rapid T₂₀ reductions (up to –1.75 s), ceiling treatments deliver the greatest STI and C₅₀ gains (e.g., STI increases of +0.16), and high-absorption walls maximize privacy metrics (D2,S and Lp,A,S,4m). A linear regression model further predicts STI from T₂₀, total absorption (Sabins), and room volume with 84.9 % conditional R², enabling ± 0.03 accuracy without specialized testing. These findings provide empirically derived, surface-specific “first‐move” guidelines for architects and acousticians, underscoring the necessity of integrating acoustics early in museum design to balance auditory and visual objectives and enhance visitor experience.