Objective and subjective acoustic assessment of music halls with passive variable systems: a case of Bilkent Music Hall

Abstract

In concert halls, the need for variable acoustics arises from the diverse requirements of different musical performances. Previous research suggests that incorporating passive variable acoustic solutions can help venues adapt to various musical needs. This research explores the challenges and potentials of passive variable techniques in symphonic music halls, focusing on Bilkent Music Hall in Ankara − the main venue for Bilkent Symphony Orchestra (BSO) and an early example of variable acoustic systems in Türkiye. Acoustical field measurements were conducted within the hall to test different configurations of passive variable system. Later, subjective data is gathered through questionnaires and online surveys conducted with BSO members, faculty and students from the Bilkent Music Conservatory. Excessive low-frequency absorption is identified as a major acoustical problem of the hall. Thus, the final step involves acoustical simulations to evaluate a proposed design intervention aimed at improving acoustical comfort for different music performances. The hall’s existing variable acoustic system is investigated across a variety of musical performances, including chamber music, orchestral music, orchestral music with choir and vocal accompaniment, solo recitals, and occasional speech-oriented activities. This analysis provides valuable insights into musicians’ acoustical experiences and preferences regarding the music hall. The objective and subjective findings are then compared with precedent cases from around the world with variable acoustics systems.