The violin case, also known as the resonance box or the body, is a whole formed by the combination of the back panel, front panel, side panel, end corner wood, edge strips, etc. Please refer to the detailed introduction of the violin structure. It can render and enhance the sound emitted by the strings, playing a role in acoustic resonance, so some people also call the piano box a resonance box. On the outside of the piano case, there are sound holes on the panel, and a tail rest is glued at the bottom of the panel. The edges of the panel and back panel are embedded with edges. There is a tail pillar hole in the middle of the side panel at the back of the piano body, and a tail pillar with a tie string plate is installed. In the inner cavity of the piano body, there is a sound beam attached to the panel, and a sound column is supported between the panel and the back panel.

The process of assembling and bonding these components together is to bond them firmly, and then finely polish them in the accompanying process.

The violin case is like a drum, where the drum is struck with a drumstick to produce sound, while the case is made by connecting the bow, strings, and bridge to produce sound. The strings and horses are like driving devices, and the bow is like a drumstick. The bow rubs against the strings, and the strings drive the bridge, which in turn drives the columns and beams inside the chamber to resonate. From the appearance, it seems that these three parts resonate, but in fact, the sound columns and beams inside the qin box play a significant role, suppressing the sound columns and beams at both ends of the qin horse's legs. The sound beam is bonded inside the panel, while the sound column hangs vertically between the panel and the back panel. From the feet of Qinma, it can be seen that the sound beam controls the bass part, and the sound column controls the treble part. There are many factors that not only control the sound quality of high and low frequencies, but also these two aspects.

In short, the sound quality of a violin is not solely caused by the case, but rather by multiple factors. Multiple parts are combined to resonate, and if one part is not done properly, it will affect the overall sound quality.

After making the piano case, install the piano head, and on the basis of the white piano, install the fingerboard, bridge, strings, column, etc. for debugging. It requires repeated debugging because you don't know which part is not done properly. You need to debug and repair it at the same time until the sound quality reaches the best state before painting. After painting, debugging is still necessary during assembly, as painting may cause changes in sound quality.

That's why a violin with good sound quality, beautiful appearance, fine workmanship and other details, which is more perfect, is expensive.