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The shelf corner (~1682 Hz) sits at or above Nyquist for rates under ~3.4 kHz. The bilinear prewarp tan() then wraps negative (unstable poles, +750 LUFS readings, -144 integrated) or aliases. Hold the design frequency below Nyquist (0.49 * sr, as Coeffs::design does). Coefficients at 8 kHz and above are unchanged. Fixes #240 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>