An investigation is described which further develops a Graphical Assessment Language (GAL) for subjectively evaluating spatial attributes of audio reproductions. Two groups of listeners, those with previous experience of using a GAL and listeners new to graphical elicitation, were involved in the study which considered the influence of a central automotive loudspeaker on listeners' perception of ensemble width, instrument focus and image skew. Listeners represented these attributes from both driver's and passenger's seats using their own graphical descriptors. Source material for the study consisted of simple instrumental and vocal sources chosen for their spectral and temporal characteristics. Sources ranged from a sustained cello melody to percussion and speech extracts. When analysed using conventional statistical methods, responses highlighted differences in listeners' perceptions of width, focus and skew for the various experimental conditions.
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