What critically influences the analysis of sonified data is not only the sonification method, but also the kind of sound projection.
Here we have various options, which are familiar from audio equipment, ranging from one to several loudspeakers set up in different configurations. From our experience we can say that earphones are a particularly good solution that suits most purposes.
For multi-channel signals we have, however, also had good experience with multi-channel audio equipment. What proved particularly useful was a 20-channel sound dome used in the study of EEG data. See some illustrations below:
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