Although originally a speaker unit that forms sound by generating wave in the air, the energy for forming sound cannot be effectively converted to sound in the existing speaker unit. In other words, about half of the energy is converted to vibration of the unit itself without becoming a sound thereby causing distortion of sound and dull vibration, and inhibiting an accurate sound formation, which is the object of the unit.
In a speaker system in which the speaker unit is incorporated in an enclosure (speaker box), the enclosure itself similarly vibrates by the vibration of the speaker unit, and such vibration is transmitted to the floor. Generally, the sound becomes difficult to accurately reproduce as the sound becomes lower unless the enclosure is securely fixed to the floor. Thus, if a low sound is emitted at large volume, the entire room may shake by the generated vibration, and the vibration may be transmitted to the adjacent room.