But Sony is reluctant to define the system in terms of discrete channels, saying instead that the four units will create a bubble of sound from 12 ‘phantom’ speakers. The latter is a technique that follows similar principles to Ambisonics and Wave Field Optimization to synthesise a soundfield with both real and ‘phantom’ sources.Įach of the four speakers contains a 19mm front-facing tweeter and full range X-balanced driver, as well as an upward-firing X-balanced driver that bounces sound off the ceiling. The former is an automated calibration that uses two mics built into each speaker to measure the room’s height, speaker distance and location. How does it achieve this wizardry? The HT-A9 supports Sony's 360 Spatial Sound Mapping, combining two technologies: Sound Field Optimisation and Monopole Synthesis.
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