Sound apparatus having vibration devices

A sound apparatus, comprising:

• a first vibration device configured to vibrate based on an input driving signal;
• a first substrate having a first main surface and a second main surface opposite to the first main surface, wherein the first vibration device is disposed on the first main surface of the first substrate;
• a second substrate having a first main surface and a second main surface opposite to the first main surface, wherein a portion of the first main surface of the second substrate is disposed to face a portion of the second main surface of the first substrate;
• a second vibration device which is disposed on the second main surface of the second substrate and configured to vibrate based on the input driving signal;
• a vibration member;
• a first member configured to connect the second main surface of the first substrate to the vibration member;
• and
• a second member configured to connect an edge portion of a rear surface of the second vibration device or the second main surface of the second substrate to the vibration member,
• wherein:
• the first member and the second member are made of different materials from the first substrate and the second substrate;
• the rear surface of the second vibration device faces the vibration member;
• and
• a central portion other than the edge portion among the rear surface of the second vibration device is not connected to the vibration member.