  Three hundred years ago, Antonio Stradivari enjoyed the golden period of the
violin making in the human history. Luthiers and researchers endeavor to study
his legendary legacy. Unfortunately, a consensus that the present progress has
reached his level remains lacking. Most of the instruments suffer from low
sounding power and enigmatic deficit of harmonic overtones. In fact, there is
significant energy dissipation in the acoustic couplings in the violin family,
completely unaware to luthiers and researchers. The current acoustic mechanism
is inefficient in resonance of the wooden plates and hence is the low rate of
mechanical energy conversion to the desired sound. We propose a new method for
the amelioration of the acoustic couplings to enhance the preservation of the
overtone components up to 161% of the pristine and to reduce the instrumental
dissipation intensity up to 3.8 dB off (73% off). It results in the
tremendously improved sound projection, the shorter reaction time, the longer
reverberation time, and consequently the enrichment of the timbre complexity.
Our physical method is applicable to the violin family of all sizes and ages,
including the Stradivari, and extendable to all string instruments.
