I think the sound is pretty good, but I feel that the piano board is too thick, the volume is low, and the vibration and resonance are not good. I want to play it for a while and it will improve. However, I have been playing it for more than a year, but there is still no improvement. I feel that only the strings are vibrating, and the body vibration is very small, lacking overall resonance. So, referring to the experience of netizens, I started to try tuning the piano. First, I adjusted the position of the code and the position of the sound column. Although after multiple adjustment attempts, I was able to find the best position for this piano, but the problem of poor vibration still exists. Then I started to fix the code because I had worked as a model worker when I was young. I bought several codes online, including expensive and cheap ones. The expensive ones were fixed according to the standards in the book, while the cheap ones were fixed according to the experience of netizens. After a lot of tinkering, I felt that each code had a different effect, and it was not necessarily the more expensive or the better the appearance, but even the code with the best effect still did not solve the problem of poor vibration. I came down to replace the sound column and bought several sound columns, including those with tight rings, loose rings, and moderate rings. I installed them according to the book and the experience of netizens. After a lot of tinkering, the technology of installing and adjusting the sound column has improved a lot, but it feels similar to the effect of changing codes. Each sound column has a different effect, but it still cannot solve the problem of poor vibration. I think it's over this time. It seems like we need to open the lid and planing board, but I'm afraid we might break the piano board, so I didn't dare to do it. A few days ago, when I was looking at a few soundbars, I thought that the thickness of the soundbars should also be related. So I used a caliper to measure the diameter of the soundbars, which were basically 6.1-6.2 millimeters. Then I ground the soundbars into several diameters of 6.0/5.9/5.8, and installed them on the piano for testing. Who knew that the diameter of the soundbars had a huge impact on the vibration of the piano. When I tried to reach a diameter of 5.8, the vibration and volume of the piano body increased very significantly. I could feel the vibration of the neck of the piano by gently plucking the strings with my hand. The vibration and resonance of the D and G strings were particularly obvious, and the pronunciation became more sensitive and rich. However, when I pulled the stress, a slight wolf sound appeared in one of the notes. I prepared to pull it for a while to see if it would disappear.

After this experiment, it has been proven that changing the diameter of the sound column can significantly improve the vibration effect. The reason may be that the sound column not only plays a role in conducting the vibration of the panel and backplate, but whether its own vibration frequency matches the panel and backplate is the key to whether resonance can be caused. The standard diameter of the sound column is a universal rule that can be basically applied under normal circumstances. However, when the piano board is too thick or too thin, the vibration frequency can be improved by changing the diameter of the sound column to match the vibration frequency of the piano board. As for how thick and suitable it should be, the appropriate diameter can only be found through experiments. The above is purely my own speculation. Please correct any inappropriate aspects.