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The mysteries of ports As simply as possible: Ports deal with all the deep lows and give the woofer(s) an easier ride - tune them right and use a good geometry and there are no downsides. Tune them too high or too low and the tone won't be as good and the cab won't handle as much power. Make them too big and the cab will be huge (this hardly ever happens); make them too small and they'll stop working right as you play louder, killing your bottom end (this is a really common problem). We design, test, adjust, test, etc and make sure they're as good as can be. ----- How do ports work?

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. Download free royal trux pound for pound rar.

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.