Status: L2 V5 build-packet candidate.
<!-- SPDX-License-Identifier: CC-BY-4.0 --> --- slug: bass-surface-drum display_name: Bass Surface Drum family: drum subfamily: frame-drum acoustic_class: single-membrane-low-tension target_tuning: fundamental_hz: 50 acceptance_band_hz: [42, 60] partials_strategy: bessel-circular-membrane-modes geometry: head_outside_diameter_mm: 800 head_effective_diameter_mm: 760 frame_depth_mm: 120 frame_wall_thickness_mm: 1.5 rim_bearing_radius_mm: 4 ergonomic_envelope: player_position: seated or stand-mounted mallet: large soft cinematic mallet (bought) strike_zone: center for fundamental, off-center for higher modes license: hardware: CERN-OHL-W-2.0 docs: CC-BY-4.0 ---
Live interactive acoustic model (Wolfram Cloud, Public-Execute). Drag the sliders; every value is computed from estimate placeholders — pending measurement, not fabrication authority.



Concept renders — not fabrication authority.