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Sonic grading is fundamentally different from traditional grading because the process relies on data and mathematical models to classify each board
Koa grading structure:AAAA – highest quality
representing less of any tree's life (say 60 years
Damping (Q) >= 150
Big leaf maple only grows in the Pacific Northwest
4 Piece Sonic Sitka Vault 6011 Sonically Graded Soundboards Sonic grading is fundamentally differentPRT is proud to bring a 4 piece top to market. These tops allow us to make soundboards from smaller diameter logs and to utilize each log more completely. Four piece tops are cut from a smaller section of a tree, representing less of any tree's life (say 60 years, instead of 120), and are therefore more consistent in all of their physical properties. Density, Q, and Stiffness are all provided, allowing you to choose the piece that exactly fits your
