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RCA bass reflex speakers. A bass reflex system (also known as a ported, vented box or reflex port) is a type of that uses a port (hole) or vent cut into the cabinet and a section of tubing or pipe affixed to the port. This port enables the sound from the rear side of the diaphragm to increase the efficiency of the system at low frequencies as compared to a typical sealed- or closed-box loudspeaker or an infinite baffle mounting. A reflex port is the distinctive feature of this popular type. The design approach enhances the reproduction of the lowest generated by the.

The port generally consists of one or more tubes or pipes mounted in the front () or rear face of the enclosure. Depending on the exact relationship between driver, the enclosure volume (and filling if any), and the tube cross-section and length, the efficiency can be substantially improved over the performance of a similarly sized sealed-box enclosure. Two inch port tube installed in the top of a Polk S10 speaker cabinet as part of a 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 air mass in this opening resonates with the 'springiness' of the air inside the enclosure in exactly the same fashion as the air in a bottle resonates when a current of air is directed across the opening.

Another metaphor often used is to think of the air like a spring or rubber band. The frequency at which the box/port system resonates, known as the, depends upon the effective length and cross sectional area of the duct, the internal volume of the enclosure, and the speed of sound in air. In the early years of ported speakers, speaker designers had to do extensive experimentation to determine the ideal diameter of the port and length of the port tube or pipe; however, more recently, there are numerous tables and computer programs that calculate, for a given size of cabinet, how large the port should be and how long the tube should be. Even with these programs, however, some experimentation with is still necessary to determine if the enclosure sounds good. A small JVC speaker with a port. If this vent air mass/box air springiness resonance is so chosen as to lie lower in frequency than the natural resonance frequency of the bass driver, an interesting phenomenon happens: the backwave of the bass driver sound emission is inverted in polarity for the frequency range between the two resonances.

Since the backwave is already in opposite polarity with the front wave, this inversion brings the two emissions in phase (although the vent emission is lagging by one wave period) and therefore they reinforce each other. This has the useful purpose of producing higher output (for any given driver excursion compared to a closed box) or, conversely, a similar output with a smaller excursion (which means less driver distortion). The penalty incurred for this reinforcement is time smearing: in essence the vent resonance augments main driver output by imposing a 'resonant tail' on it. For frequencies above the natural resonance of the driver, the reflex alignment has no influence.

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