4th & 6th-Order Dual-Chamber Bandpass Subwoofer Ripple, Excursion & <17 m/s Port Designer

Deterministic 6th-order coupled dual-Helmholtz lumped acoustic network state-space solver + port boundary-layer air velocity v_max < 17 m/s guard engine (.pdf, .dxf, .csv, .json) built for Sundown Audio, Eighteen Sound, Function-One, d&b B22 — zero-upload ephemeral Wasm RAM execution.

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