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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