Investigating the influence of seating area design and enclosure on the seat-dip effect using scale model measurements

Henna Tahvanainen*, Tapio Lokki, Hyung-Suk Jang, Jin-Yong Jeon

*Corresponding author for this work

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Abstract

The low-frequency attenuation in the direct sound due to the concert hall seats, i.e., the seat-dip effect, is studied with the help of a scale model comprising an adjustable seating area and an enclosed box. More particularly, different seat underpass sizes and floor raking angles are studied, and the results are averaged over multiple source positions. With the measurements on the seating area only, the main seat-dip frequency is found to depend on the seat back rest height, and on the degree of obstruction of the seat underpass. The attenuation bandwidth is found to depend mainly on the floor raking. The differences become less clear when seating area is enclosed by concert hall walls and ceiling because the early reflections from the concert hall geometry compensate the low-frequency attenuation in the direct sound. In addition, the low frequencies below the main seat-dip frequency are found to increase in the presence of unobstructed seat underpasses, and such seats are recommended for the maximal bass response in a concert hall.

Original languageEnglish
Article number15
Number of pages10
JournalActa Acustica
Volume4
Issue number4
DOIs
Publication statusPublished - 11 Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • SOUND
  • ACOUSTICS

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