Many people are familiar with some common sense of adjusting the pitch column, which is the easiest and most effective way to adjust it on a violin. After a period of use, the sound column will move away from its original position, and the sound of the other piano itself also has seasonal changes, which require the sound column to be constantly adjusted.  

During the repair work, we found that some of the piano's sound columns were very thin and the wood was not carefully selected, making it appear to be the work of outsiders. In this way, the original sound of the qin will be significantly damaged.  

Many people have encountered the trouble of the sound column collapsing when changing strings. The sound column of the new qin was repaired before the strings were installed. After the strings were installed, the plate began to deform normally under the tension of the strings and the top force of the sound column. The panel and backboard at the position of the sound column would slowly bulge, so the original sound column would appear shorter. The solution is to replace the sound column with a longer one. The ideal length of the sound column standing in the correct position should be slightly longer than the distance from the panel to the back panel. The installer will feel that the sound column exerts gentle pressure on the two sound boards, and excessive pressure on the sound board will suppress vibration.  

The inner edge of the guqin's sound hole is higher than the outer edge, and the backboard column is slightly higher than the surrounding area, which is the result of long-term accumulation of this deformation. Changing the sound column is a simple task, but it is also not an easy job to replace a good piano with precise sound columns. Firstly, it is necessary to choose suitable wood, as the wood used for the sound column requires a high density to produce bright pronunciation. There should be at least six annual rings on a sound column. If your piano sound needs to be harder, choose harder wood. Next is size. The thick sound column suppresses vibration, while the thin sound column allows for free vibration. The thickness of the sound column is also a means of adjustment. The sound column is usually six millimeters thick. If necessary, a thicker column can make the sound more solid, but it may lose some resonance effect. The end face of the sound column should be very close to the back plate, and in the future, it can be easily dragged and stopped with the sound column hook. Otherwise, it will be difficult to drag and may scratch the inside of the soundboard.  

In fact, adjusting the position of the sound column is to adjust the piano code, the relationship between the sound column and the bass beam. You need to use a specialized ruler to measure the position of the sound column. If not, a steel ruler can also replace it. The violin sound column is located on the inner side of the outer edge of the code foot. 5mm, 2 to 2 behind the foot of the code. 5mm, the position of the sound beam is also the same distance inward relative to the outer edge of the left foot, which is the basis for the balance of high and low frequencies in the violin. These dimensions are not absolute and need to be adjusted appropriately according to the specific instrument.  

Moving the column towards the bass beam can remedy the weakness of the bass, while moving in the opposite direction can enhance the treble. The distance between the sound column and the piano code determines the elasticity of the sound, and adjusting this distance can change the degree of freedom and cohesion of the sound.  

Finally, please note that when adjusting the position of the sound column, the strings should be loosened first, especially the high pitched strings, otherwise internal damage to the panel or splitting of the sound column may occur. This job is best done by a qin maker, and the performer can determine how to change the sound themselves. Repeat this process several times, and the sound column will stand in the recognized best position.