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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