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This article discusses the use of sound sculptures as tunable modulators of the transmission characteristics of acoustic sources during performance. We propose IRIS, a sculpture consisting of a periodic composite formed by an acoustic double-fishnet made up of two discs with periodic perforations and independent rotation. From the analysis of the transmitted field and binaural impulse responses, we observed a sound focusing whose spectral and spatial location varies depending on the relative angle of rotation between the disks. This effect is verified using a synthesized sustained sound and a chord progression, and finally validated perceptually in a listening test with 11 musicians.

IRIS: A tunable sound sculpture based on acoustic periodic composites for musical performance