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Deterministic 3D Helmholtz rectangular rigid-wall eigenmodes f = (c/2)*sqrt((nx/Lx)²+(ny/Ly)²+(nz/Lz)²) + Welti multi-sub complex pressure superposition engine (.svg, .pdf, .json, .txt) built for SVS, KEF, Genelec, miniDSP — zero-upload ephemeral Wasm RAM execution.

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