Tests acoustic floor derivation in CDN systems, suggesting need for further exploration.
CDN-181 is the first D9 acoustic-floor origin audit after CDN-180. It tests whether the nonzero CDN-179 acoustic floor can be derived from the exact finite-k gapless branch of the CDN-163 linearised system. The result is partial: finite-k dispersion explains the positive sign and rough scale of the floor, but simple no-fit Gaussian source-band weights do not reproduce the full three-point floor sequence. D9 remains open, with the next target identified as the response-weighted spectral band \(Weff(k,ξ)\).
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Nicky Joseph Hubertus Catharina Hacquier (2026) studied this question.
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