Parametric Measurement of 3D Monolithic Spatial Resonators Across 22 cm, 44 cm, and 66 cm Scales **1. Executive Summary & Intent\**The objective of this four-month pilot study is to experimentally verify the acoustic, modal, and cymatic behavior of the three-armed spatial resonator TRIAURAL-TETRAMID, defined by a 120° rotational symmetry and a 109.47° tetrahedral vector core fabricated from a single continuous metal monolith.Phase 1 focuses on a tightly controlled 3 × 3 matrix (9 specimens) using a uniform arm cross-section derived from the existing reference prototype. This scope makes it possible to measure material-associated differences and frequency-scaling relationships across three isotropic scales. All resulting datasets, CAD files, protocols, and documentation will be released into the public domain under a CC0 license.