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Koa grading structure:AAAA – highest quality
Because we consider damping to be the most important factor in soundboard selection
we personally select all of our spruce logs
If sonically graded
AAAA – our best soundboard visually
Sonic Sitka Vault 2623 Sonically Graded Soundboards Koa grading structure:AAAA – highestAll sonically graded tonewood offered in the Pacific Rim Tonewoods Vault includes the material properties for that specific set. Density, Q, and Stiffness are all provided, allowing you to choose the piece that exactly fits your needs. In addition to the data provided, High Q (Q >= 160) and High Stiffness boards are exclusively available in the Vault. Sonic grading is fundamentally different from traditional grading because the process relies on data
