When rendering an ambisonic recording, a uniform speaker array is often preferred with the number of speakers chosen to suit the ambisonic order. Using this arrangement, localization in the lateral regions can be poor but can be improved by increasing the number of speakers. However, in practice this can lead to undesirable spectral impairment. In this paper a time-domain analysis of the ambisonic decoding problem is presented that highlights how a non-uniform speaker distribution can be used to improve localization without incurring perceptual spectral impairment. This is especially relevant to binaural decoders, where the locations of the virtual speakers are fixed with respect to the head, meaning that the interaction between speakers can be reliably predicted.
https://www.aes.org/e-lib/browse.cfm?elib=16779
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