Sometimes the dust-cap takes the form of a small conical shape, claimed to improve dispersion at higher frequencies. In most speaker drivers such dust-caps are constructed so as to be relatively acoustically inert. The shape and materials used in the cone and whizzer are highly optimized.Īnother arrangement uses a radiating dome in place of the usual dust-cap it is acoustically active. For example, a small low-mass horn or whizzer cone can be mounted where the voice coil and diaphragm meet, thereby increasing the output at high frequencies. Often the cone structure includes optimizations to enhance high-frequency performance. Typically, a full-range drive unit consists of a single driver element, or voice coil, used to move and control a diaphragm. Most single driver systems, such as those in radios, or small computer speaker designs, cannot reproduce all of the audible frequencies or the entire audible audio range (i.e., sound within the range of human hearing). The frequency range of these drivers is maximized through the use of a whizzer cone and other means. Goodmans Axiette, one of the first single-cone full-range drivers.Ī full-range loudspeaker drive unit is defined as a driver which reproduces as much of the audible frequency range as possible, within the limitations imposed by the physical constraints of a specific design.
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