Acoustics of auditoriums

Step into a bygone era of engineering curiosity, where the University of Illinois’ own auditorium became a living laboratory for sound. This bulletin chronicles the early 20th‑century struggle to tame echo and reverberation in a grand, hemispherical hall, detailing how plain walls and limited funding turned a performance space into an acoustic puzzle. Listeners will hear vivid descriptions of clapped hands spiraling into a “chaos of sound,” and musicians unintentionally keeping time with lingering echoes.

Beyond the dramatic anecdotes, the work unfolds a methodical six‑year investigation that blends careful measurement with practical fixes. Detailed illustrations and photographs guide the ear through the hall’s arches, balconies, and stage, revealing the principles that still inform modern theater design. By the end, the narrative offers timeless lessons on shaping spaces so every voice and note can be heard clearly, all while preserving the charm of an early engineering experiment.