How to do a good job of sound insulation in piano room

I want my children to play the piano from primary school, but I am afraid that their practice will affect the rest of their elders or their neighbors. I want a stereo, but I can make a simple board for sound insulation decoration. The wall is 7 cm and the top surface is 7 cm. It is best to make a special shock absorber on the lower foot of the piano. Most people think that foot pads can be used. The practical construction proves that the low-frequency transmission of the piano bracket is very large, and the general foot pad can only subtract 40% of the low-frequency vibration. Windows should also be replaced with soundproof windows. Professional sound insulation. That is, if conditions permit, you can use a room for practicing the piano, and generally you can do professional sound insulation above 1 1 square meter. The steps of the project are as follows: (1): a new light steel keel wall is erected at the outer space of the original wall 1-2 cm, with 5 cm of sound insulation cotton in the middle and a layer of sound insulation felt on the keel surface. (3): Door treatment, new thickened soundproof door, or adding soundproof measures on the basis of the original door. (4): The ceiling at the top adds a suspended soundproof roof to the original ceiling. The general thickness is 13 cm. (5) Ground treatment: Carpets above 1.5- 1.5 shall be laid on the ground, and a damping pad shall be added under the piano. 2. Ordinary sound insulation; Hang some decorative carpets on the wall, or stick cork boards on the wall, lay a quilt on the back of the piano, and add shock-absorbing pads on the ground.