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This culminated in a patent, coupled with an innovative app which granted users the unique ability to define venues in 3D and establish designated regions within it, each with its desired sound pressure level. This became Pro Fidelity, a line of PA speakers that product that looked great, sounded great and were able to reduce noise nuisance, employing as many of our research findings as possible. BACCH 3D Spatial Audio is a groundbreaking technology that creates a spatial soundstage from only two speakers through crosstalk elimination.