Flat Panel Speakers:-use voice coils or other apparatus mounted to flat panels to act as the source of sound. The flat panel acts as a diaphragm. Below are some examples of different designs. Different materials can be used as a diaphragm, from vinyl to Styrofoam. This is different from a diaphragm speaker in that the moving voice coil is not wrapped around the same material as the flat panel. The panel part is adhered to the coil assembly.
Standard flat panel electrodynamic loudspeaker have been difficult to make because it is difficult to vibrate the entire flat surface evenly while creating good frequency response. Thus other speaker types have evolved to try to make a flat speaker.
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