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AAA – clean top
It is sought after for its figure
The boards are then resawn into bookmatched sets and graded into one of three traditional grades
We had the good fortune at PRT to recently acquire a 900-1
the boards are classified into various groupings
Sitka Spruce - Sonically Graded Size:Classic AAA – clean topSonic grading is fundamentally different from traditional grading because the process relies on data and mathematical models to classify each board, this helps us to be much more accurate than what eyes only grading can do. By evaluating density, stiffness, Q (damping) and several other factors, the boards are classified into various groupings. Every sonically graded board is required to meet the following specifications: Density in the range of 350
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