Composers of electroacoustic music have engaged with 3D sound since the first performances of these works in the1950s. Currently, the majority of electroacostic compositions continue to be presented in 2D. Although human auditoryperception is 3D, music composition has not adequately exploited the creative possibilities of this dimension. It isargued that ecologically valid perceptual experiments are required when attempting to formulate compositionaltechniques for electroacoustic music composition. Further, the paper presents a novel research method for theperceptual evaluation of 3D multi-channel electroacoustic music. The spatial attributes of envelopment, spatial clarity,and engulfment, are employed to evaluate composed multi-channel 3D sound executed within an ecologically validconcert hall environment. Results focus on the perceptual rating of the spatial attributes, envelopment and the proposed3D unique attribute, engulfment. The results for Experiment 1 suggest that engulfment is a 3D unique spatial attributeand perceptual differs to envelopment in 3D spatial scenes.
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