Patent ID: 7842867

Claim:
A device adapted to be mounted within a resonance chamber of a stringed instrument, said stringed instrument including a resonance chamber and a soundboard, said soundboard defining a soundhole where said soundhole is open when the device is installed, the device comprising: a first surface on an upper portion of said device where said device is substantially symmetrical about a central vertical axis, and said first surface is offset such that the first surface upwardly and outwardly faces an inside edge of the soundhole; the first surface having an arcuate cross sectional shape which is made to be concave upwardly and outwardly relative to the inside edge of the soundhole; and the device, when installed, is supported from below and occupies a space beneath the soundhole while the soundhole remains open and the first surface is oriented on the upper portion of the device to receive sound energy from the resonance chamber and uniformly reflect the sound energy out of the open soundhole thus changing an acoustical characteristic of the instrument.