Guzheng has a bad tone. What is the reason?

There are many reasons for this timbre, which may be the wood factor or the shape of the piano is not fixed when it is made. Generally, there are few reasons for strings, so long as they are not changed, they will not be affected. However, the piano is sometimes like this. It doesn't sound crisp at first, but it feels good at first, and it may not be good in the future. The more you play the piano, the better the timbre. I have been playing the piano for 20 years. The timbre is good, except that the code sometimes slips. The wood coefficient depends on the weather. If it is dry, you can put a bucket of water under the piano to help prevent it from drying. Don't put the piano in a place with strong sunlight, but it can't be too wet. You drain the water according to my method and see if it will improve after a while. I can't help it if the piano is not finalized ~ ~ ~