Correlation between Anatomical Grading and Acoustic–Elastic Properties of Resonant Spruce Wood Used for Musical Instruments

This paper deals with the acoustic and elastic properties of resonant wood, classified into four classes, according to classification wood quality by manufacturers musical instruments. Traditionally, grades are determined on basis visual inspections macroscopic characteristics (annual ring width, regularity, proportion early late absence defects, etc.). Therefore, in this research, we studied whether there correlations between anatomical used for construction violins. The results regarding identification spruce, color, acoustic/elastic properties, ultrasonic measurements, were statistically analyzed highlight connection properties. From statistical analysis, it can be seen that only variables power separate classes (in descending order importance) speed sound propagation radial direction, Poisson’s ratio longitudinal–radial sounds longitudinal direction.