Microphone Sensitivity, SPL-Max, Preamp EIN & ADC Headroom Gain-Staging Solver

Deterministic Acoustic Pascal-to-dBu voltage conversion (20*log10(P_pa * S_mv)) + Johnson-Nyquist thermal resistor noise + cascaded Friis SNR budget engine (.pdf, .svg, .json) built for Neve, Neumann, Universal Audio, API Audio — zero-upload ephemeral Wasm RAM execution.

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