The frequency response of differently machined wooden boards

The changes in frequency response function (FRF) of a guitar top plate due to different machining processes used to finish the guitar tops were analyz ed. The way of machining the tops had a measurable but hardly explainable e ffect on their FRF because of not well-separated frequency peaks. The addit ional measurements of FRF of differently machined square-shaped plates show ed more clearly the influence of the machining process on the acoustic prop erties of a wooden board. Therefore, a general conclusion is that the machi ning process influences the acoustic properties of a wooden board. The reas on for this influence lies in the different surface shapes of differently m achined boards. (C) 1999 Academic Press.