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In a closed-box loudspeaker, the air inside the box acts as a spring, returning the cone to the zero position in the absence of a signal. A significant increase in the effective volume of a closed-box loudspeaker can be achieved by a filling of fibrous material, typically fiberglass, bonded acetate fiber (BAF) or long-fiber wool.
A multi-stop truck operated by FedEx Ground. A multi-stop truck (also known as a step van, walk-in van, delivery van, or bread truck; "truck" and "van" are interchangeable in some dialects) is a type of commercial vehicle designed to make multiple deliveries or stops, with easy access to the transported cargo held in the rear.
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
1975 Ford Courier. For the 1972 model year, the Ford Courier was introduced as the first compact pickup truck sold by Ford. Following the rise of the compact truck segment during the 1960s, Ford entered into a partnership with Mazda to market the Mazda B1800 in North America; the Courier would become the first of several jointly manufactured vehicles between the two companies from the 1970s ...
Two-inch port tube installed in the top of a Polk S10 speaker cabinet as part of a DIY audio project. This port is flared. Unlike closed-box loudspeakers, which are nearly airtight, a bass reflex system has an opening called a port or vent cut into the cabinet, generally consisting of a pipe or duct (typically circular or rectangular cross section).
The trunk could be opened remotely by turning the ignition key to the far left, and a floor-mounted button engaged the radio's signal seeking feature. A separate signal seeking feature was installed for rear seat passengers, installed behind the front seat facing the rear seat compartment. The 60-series Crown received a facelift in January 1973 ...