Enhancing immersive sensation at the Iwami Kagura performance space using omnidirectional speakers: a case study of the worship halls at Shrines in the Iwami region, Japan

Iwami Kagura, originated from Iwami region in western Shimane, Japan-is a religious rituals narrating Japanese mythology has been persevered through centuries, maintaining its relevance in the present time. These religious rituals mainly dedicated to gods, features dynamic masked dance, fast music and vibrant costume creating an immersive experience for diverse audiences. The Iwami Kagura performances are popular inside and outside of Japan making a source of tourism for the region. Originally, Iwami Kagura was performed in the worship halls at shrines, therefore, it is important to understand the sacred atmosphere created by the performance considering acoustic measures that make the space immersive. In this study, we focused on the Iwami Kagura performed at worship halls of two shrines and compared the acoustic effects of omnidirectional speakers in both the shrines. Usually, directional speakers are used to amplify parts of performers' voices and music, however, performing space at shines are small in volume, and the directional speakers will provide strong direct sound to performers' voices and sound of flute. Thus, we studied acoustic characteristics of performance space within the precincts of the shrines, the acoustic effects of loudspeakers used and improved sense of presence using omnidirectional speakers.