Sitka Spruce 4 Piece - Sonically Graded Redwood Tops Sonic grading is fundamentally different

Sonic grading is fundamentally different from traditional grading because the process relies on data and mathematical models to classify each board

Les Paul size and over

with different figure intensities

These tops allow us to make soundboards from smaller diameter logs and to utilize each log more completely

Sitka Spruce 4 Piece - Sonically Graded Redwood Tops 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. If sonically graded, we measure them with BING testing for density, stiffness and Q (damping). Every