Grand piano soundboard with a bar and sound tunnels

A grand piano soundboard with a bar and sound tunnels comprising:

• an inner wall of the soundboard arranged toward the strings of the piano;
• and
• an outer wall of the soundboard provided with a first groove and a second groove, wherein the first groove is arranged diagonally in a width direction of the soundboard, and the second groove is arranged diagonally in the length direction of the soundboard;
• the first groove and the second groove cross and connect with each other on the outer wall of the soundboard, the intersection point is located in the center of the soundboard, and then the outer wall of the soundboard is divided into four resonance regions;
• a center of the outer wall of the soundboard is also provided with a bar assembly, which comprises a plurality of strip-shaped bar members, which are arranged on both sides of the first groove and the second groove in pairs;
• the first groove and the second groove respectively form a sound tunnel on the outer wall of the soundboard.