The design of speaker systems for Ambisonic playback is governed by several constraints: * the desired spatial operating range (horizontal-only, hemispherical, full-sphere), * the predominant resolution (= Ambisonic order) of the expected program material, * the desired localisation performance and size of listening area versus the available number of speakers and amplification channels, and * the theoretically optimal distribution of speakers versus the actually available placement and/or rigging options.