Driverdesign.docVIP

 HYPERLINK /wiki/Cutaway_view \o Cutaway view Cutaway view of a dynamic loudspeaker. Driver design A stamped steel loudspeaker basket frame is clearly visible (here, blue-grey). The most common type of driver uses a lightweight(质轻的)  HYPERLINK /wiki/Diaphragm_(acoustics) \o Diaphragm (acoustics) diaphragm, or cone, connected to a rigid（刚性的） basket, or frame, via a flexible（柔软的） suspension that constrains（绑住） a coil of fine wire to move axially through a cylindrical（圆柱形的） magnetic gap. When an electrical signal is applied to the  HYPERLINK /wiki/Voice_coil \o Voice coil voice coil, a  HYPERLINK /wiki/Magnetic_field \o Magnetic field magnetic field is created by the electric  HYPERLINK /wiki/Current_(electricity) \o Current (electricity) current in the voice coil, making it a variable electromagnet. The coil and the drivers magnetic system interact, generating a mechanical force that causes the coil (and thus, the attached cone) to move back and forth, thereby reproducing sound under the control of the applied electrical signal coming from the  HYPERLINK /wiki/Amplifier \o Amplifier amplifier. The following is a description of the individual（单个的）components of this type of loudspeaker. The diaphragm is usually manufactured with a cone- or dome-shaped profile（外形，轮廓）. A variety of different materials may be used, but the most common are paper, plastic, and metal. The ideal material would be stiff（硬），to prevent uncontrolled cone motions; light, to minimize starting force requirements and energy storage issues; and well  HYPERLINK /wiki/Absorption_(acoustics) \o Absorption (acoustics) damped（阻尼）, to reduce vibrations（振动） continuing after the signal has stopped. In practice, all three of these criteria（标准）cannot be met simultaneously（同时地） using existing materials; thus, driver design involves  HYPERLINK /wiki/Trade-off \o Trade-off trade-offs（交替使用）. For example, paper is light and typically well damped, but is not stiff; metal may be stiff and light,