A series of studies were conducted to investigate the effects of different sound source directivity representations on perceived differences in auralizations. The first study (Wang & Vigeant 2008) showed that subjects could not distinguish between auralizations created using both omnidirectional and measured static directivities of individual instruments. Differences may not have been observed since source directivities were not available for all octave bands of interest (125–8000 Hz). Significant differences were perceived between the auralizations generated using an omnidirectional source and a highly directional source for all bands. For the second study (Vigeant, Wang, & Rindel 2011), the effects of using 4- and 13-channel solo instrument anechoic recordings versus single channel recordings on realism and source width were evaluated. In general, the results showed an improvement in realism and decrease in source width with an increasing number of channels. In the final study (Vigeant, Wang, & Rindel 2008), 5-channel solo instrument anechoic recordings for two orchestral pieces were used to investigate the effects of using multi-channel and multi-source representations of an orchestra on realism, source depth, source width, and ease of distinguishing between instrument parts. For some of the cases studied, significant differences were found with the most complex representation of the orchestra.