Cushion and acoustic system with the cushion

A cushion comprising:

• a resin body with a spring structure comprising a three-dimensional structure including voids at a predetermined bulk density, the three-dimensional structure being obtained by contacting, entwining, and gathering adjacent ones of random loops or curls of continuous filaments made from a thermoplastic resin in such a manner as to allow the resulting structure to have a layered structure in which layers composed of the filaments having high bulk density as superficial layers are formed on a front and rear of the resin body with the spring structure in a lengthwise direction and a layer composed of filaments having a low bulk density as a core layer is interposed between the superficial layers, wherein the resin body with the spring structure supports at least an upper half of a human body when using the cushion;
• and
• a speaker incorporated in the resin body with the spring structure or disposed on one of the superficial layers of the resin body with the spring structure,
• wherein each of the superficial layers has a bulk density of 0.2 to 0.5 g/cm3 and a void ratio of 44 to 77%, and the core layer has a bulk density of 0.01 to 0.15 g/cm3 and void ratio of 83 to 99%,
• a part of or all of the filaments composing the resin body with the spring structure are hollow,
• a diameter of the filaments composing the resin body with the spring structure is 0.3 to 3.0 mm when the filaments are solid, a diameter of the filaments constituting the resin body with a spring structure is 1.0 to 3.0 mm and a hollow ratio of the filament is 10 to 80% when the filaments are hollow,
• each of the filaments composing the resin body with the spring structure is functioned as a medium to conduct a wave to the human body,
• the wave for obtaining perception of sound or bodily sensation by vibration is conducted with each of the filaments composing the resin body with the spring structure as a media, and
• sonic wave without distortion is resonated on the superficial layers of the resin body with the spring structure.