A build-planning resonator, not a decorative slat-wall page.

The designer turns target frequency, slot geometry and sealed cavity depth into a tunable absorber receipt with a frequency curve, build candidates and a visual board. It complements porous broadband panels and Helmholtz traps by covering the common wood-slat panel use case.

Boundary: Planning model only. Seal the cavity, keep construction rigid and verify final treatment with measurement.