Subjective comparisons of room acoustics require high-fidelity auralizations. Earlier research has shown that room impulse response measurements and directional analysis with the Spatial decomposition method provides accurate reproductions of concert hall acoustics in multi-channel listening. Moreover, timbral aspects have been found important for the overall audio quality, even more than spatial fidelity. This paper explores the effect by the number of true and virtual loudspeakers, and application of amplitude panning, to brightness of the sound. Results from a listening test with concert hall auralizations suggest that amplitude panning reduces the perceived brightness in both loudspeaker and headphone listening.
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