The influence of technological order on sound quality of violin
Panel: In addition to high demands on materials, manufacture of violin is also very complex and exquisite. From material selection to production and casting, procedures are complex, workmanship is exquisite, and parameters are delicate, which is quite demanding. Craftsmen should choose spruce that has been air-dried for a long time to ensure hardness of wood and to minimize rate of expansion of wood. When cutting panel materials, manufacturer will make every effort to maintain vertical and vertical grain direction of wood. Keep wood fibers as parallel to panel surface as possible. For this reason, not a saw, but a knife cutting method will be used to cut material. Because saw cuts through wood fibers, destroys fibrous structure of wood, affects hardness of panel, and reduces sound transmission of panel.
The violin board with good sound quality requires vertical and straight texture, no scar, no fat cells, no repair, distance between middle rings is from 1.22mm, and edge rings are less than 3mm. Panels with a grain pitch of 2 mm have best sound quality.
Protection panel: When violin sounds, resonance created by speaker, which consists of front panel, back panel and side panels, not only increases volume of sound of friction and vibration of bowstring, but also increases thickness of sound. Make sound quality softer and fuller, clearer and brighter. More pleasing to ear.
Someone once did following experiment, replacing back of a violin with wooden planks. As a result, volume drops sharply and sound quality becomes thin and diffuse. It can be seen that shield plays an indispensable and important role in resonance of sound of violin. The thickness of backboard material and its fit to panel directly affect sound quality of violin.
Curved construction: Italian classical violin makers were first to recognize this problem. They will all experiment with curved structure to find best sound quality.
Antonio Stradivari "preferred a flatter, curved structure, resulting in a louder sound." The arc in middle becomes wider and flatter. In this way, vibration area of the piano board is increased, so piano sound is more powerful and volume is higher."
Early violins by Niccolò Amati have a higher arc and a smaller vibration area. The sound quality of violin is relatively wet and soft, but sound lacks depth and power. This small volume violin was adapted to needs of small court and ecclesiastical performances in 17th century. However, with advent of concert halls, scale of performances has expanded, and violins of large volumes are objectively required. Therefore, in process of making violin in last years of his life, Amati lowered arc structure of violin, making sound quality of violin thick and powerful, with great penetrating power. Later, Niccolo Amati's son made a new modification of violin's curved design, whichwhich improved sound quality of violin to a certain extent. British contemporary luthier John Dilworth has a passion for reproducing classical famous violins. What he admires most is radial structure of a violin. He believes this is most important factor influencing sound quality of a violin.