Patent ID: 7645354

Claim:
A method of manufacturing an audio device having an acoustic layer of stone bonded to a wooden substrate, said method comprising the steps of: a. milling a stone piece to a required thickness; b. cleaning at least one pore of said stone; c. applying a penetrating material to said stone; d. removing excess penetrating material, if any, from a surface of said stone; e. processing the surface of said stone and said wood layer to matching tolerances to provide substantially complete surface-to-surface contact wherein one of said wood layer and said stone layer is heated to above ambient temperature and the other of said wood layer and said stone layer is cooled to below ambient temperature and said wood layer and said stone layer are bonded together while one of said wood layer and said stone layer is above ambient temperature and the other of said wood layer and said stone layer is below ambient temperature; f. applying a flowable adhesive to the surface of at least one of said wood layer and said stone; g. removing excess adhesive, if any, from said surface of said at least one of said wood layer and said stone; and h. acoustically adhering said wood layer to said stone layer.