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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).
Its relatively low adoption in commercial speakers can mostly be attributed to the large resulting dimensions of the speaker produced and the expense of manufacturing a rigid tapering tube. The Voigt pipe was designed in 1934 by Paul G. A. H. Voigt and is also referred to as a tapered quarter-wave pipe (TQWP) or tapered quarter-wave tube (TQWT).
MTX Audio loudspeaker enclosures (with rear panel reflex port tubes) which can mount 15-inch woofers, mid-range drivers and horn and/or compression tweeters. In this photo, only one driver is mounted. A cabinet with loudspeakers mounted in the holes. Number 1 is a mid-range driver.
While boxed hi-fi speakers are often described as being acoustic suspension or ported (bass reflex), depending on the absence or presence of a port tube or vent, it is also true that, in typical box speakers with more than two drivers, the midrange drivers between the woofer and tweeter are usually designed as acoustic suspension, with a ...
A transmission line loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmission line within the cabinet, compared to the simpler enclosures used by sealed (closed) or ported (bass reflex) designs.
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The effect is illustrated in Fig. 1, which shows a hard boundary at one end (the speaker) and the open-ended line vent at the other. The phase relationship between the bass driver and vent is in phase in the pass band until the frequency approaches the quarter wavelength, when the relationship reaches 90 degrees as shown.
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