Reflex port is the distinctive feature of a very popular variety of loudspeaker enclosures (bass reflex) which enhances the reproduction of the lowest frequencies generated by the woofer. The port generally consists of one or more tubes mounted in the front (baffle) or the rear side of the loudspeaker. This allows extending the (deep end of the) frequency response of the system, which means that the loudspeaker can reproduce the sound of musical instruments that generate low frequency (bass) in a better way than that of an equally sized sealed enclosure. Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... A Sony 9 inch woofer. ... Frequency response is the measure of any systems response to frequency, but is usually used in connection with electronic amplifiers and similar systems, particularly in relation to audio signals. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
Though advantageous in regards of deep bass, the bass reflex cabinet is known to have poor transient response compared to the sealed enclosure cabinet at frequencies near the lower limit of the frequency response. In some cases the frequency range in which the transient response is subjectively adequate can be widened due to the drop in the lower frequency limit. Transient means passing with time. ...
Achieving a balanced bass reproduction from a sealed box is simpler than properly aligning the components of a bass reflex system, and home constructors often select a sealed box for their first project.
Technical description
Reflex ports are preperly described under the lumped component model. Refelex ports can cause sound quality problems when the lumped component model breaks down. They form part of a loudspeaker topology. Lumped component model In general, the lumped component model is a way of simplifying the behaviour of spacially distributed systems into a topology consisting of discrete entities that approximate the behaviour of the distributed system under certain assumptions. ...
Bass reflex (also known as a ported, vented box or reflexport) is a type of loudspeaker enclosure that utilizes the sound from the rear side of the diaphragm to increase the efficiency of the system at low frequencies as compared to a typical closed box loudspeaker.
The effect of the various speaker parameters, enclosure sizes and port (and duct) dimensions on the performance of bass reflex systems was not well understood until the early 1970s.
The ported box system is more complex than the sealed box system, and as such it generally has poorer transient response.
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