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Bass reflex enclosure schematic (cross-section). RCA bass reflex shelf stereo speakers.. A bass reflex system (also known as a ported, vented box or reflex port) is a type of loudspeaker enclosure that uses a port (hole) or vent cut into the cabinet and a section of tubing or pipe affixed to the port.
This design falls between acoustic suspension and bass reflex enclosures. It can be thought of as either a leaky sealed box or a ported box with large amounts of port damping. By setting up a port, and then blocking it precisely with sufficiently tightly packed fiber filling, it is possible to adjust the damping in the port as desired.
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 ...
In the same way as a ported loudspeaker, a passive radiator system uses the sound pressure otherwise trapped in the enclosure to excite a resonance that makes it easier for the speaker system to create the deepest pitches (e.g., basslines). The passive radiator resonates at a frequency determined by its mass and the springiness (compliance) of ...
A rotary woofer is a subwoofer-style loudspeaker which reproduces very-low-frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...
Balikbayan boxes may contain items the sender thinks the recipient would like, regardless of whether those items can be bought cheaply in the Philippines, such as non-perishable food, toiletries, household items, electronics, toys, designer clothing, or items difficult to find in the Philippines. [15] A balikbayan box intended for air travel is ...
The Honda Super Cub (or Honda Cub) is a Honda underbone motorcycle with a four-stroke single-cylinder engine ranging in displacement from 49 to 124 cc (3.0 to 7.6 cu in).. In continuous manufacture since 1958 with production surpassing 60 million in 2008, 87 million in 2014, and 100 million in 2017, [2] the Super Cub is the most produced motor vehicle * in history. [3]
Academi, formerly known as Blackwater and Blackwater Worldwide, is an American private military contractor founded on December 26, 1997, [2] by former Navy SEAL officer Erik Prince.
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