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The dust cap (also known as dust dome, or dome) is a gently curved dome mounted either in concave or convex orientation over the central hole of most loudspeaker diaphragms. It protects the inner mechanics (such as the pole pieces and the voice coil ) from small particles (which can cause rubs ) and other contamination.
A tiny coffeehouse may only need a single 10-inch subwoofer cabinet to augment the bass provided by the full-range speakers. A small bar may use one or two direct-radiating 15-inch (40 cm) subwoofer cabinets. A large dance club may have a row of four or five twin 18-inch (45 cm) subwoofer cabinets, or more.
It incorporated a high-frequency horn that sent sound through a hole in the pole piece of a 15-inch woofer for near-point-source performance. [13] Altec's "Voice of the Theatre" loudspeaker system was first sold in 1945, offering better coherence and clarity at the high output levels necessary in movie theaters. [ 14 ]
The third-generation Grand Marquis went on sale in late 1997 for the 1998 model year with an evolutionary update to the exterior and interior. While the 1992 Crown Victoria was better received in the marketplace than the new-for-1991 Chevrolet Caprice, its exterior design (inspired by the Ford Taurus ) was not as popularly accepted as the Grand ...