Subjective listening tests dedicated to 5.1 multichannel were conducted using various recording and mixing configurations. Two ambience microphone arrays ('Hamasaki squares'), differing in size, were used to record the hall reverberation, in addition to direct sound microphones, providing a separation between direct and reverberant sound. Differences between the reverberation recording systems, in order to study its optimization regarding size, were evaluated using a set of spatial subjective attributes. Post-processing parameters (time delay between direct sound and reverberation, front/back distribution of reverberation) were investigated along similar attributes. Results underlined significant differences between the two 'Hamasaki square' systems. The time delay parameter showed low influence on listener envelopment and apparent source width, whereas front/back distribution of reverberation showed a significant effect on these attributes.
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