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The double bass-reflex system is intended for further enhancement of bass sound, and can be achieved if an additional bass-reflex process is given to bass-reflex system enclosures.
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With phase inverting enclosures, over sealed enclosures, reproduction of an extended bass frequency range can be expected if the enclosure volume is the same. This can be carried out by making back sound present only within the enclosure of a selected range of frequencies resonated and inverted, and by adding such processed sound to the sound originally present at the frontal side of the baffle through the port. With phase inverting enclosures, a port (duct) is provided to enhance bass sound of a selected frequency range. Confining the sound exiting from the back of a baffle within an enclosure is the theory of the sealed enclosure system. This type of enclosure, as well as the sealed type, is one of the standard enclosure systems. One factor in building successfulsealed type enclosures is careful bonding using adhesive to ensure satisfactory sealing.Ī phase-inverting type enclosure is called a bass-reflex type enclosure.
#Folded pipe speaker enclosure design drivers#
Thus, only sound radiated from the frontal side of drivers will reach the listeners.The advantage of sealed type enclosures is peculiarity-free bass sounds and good transient characteristics of bass sound. It therefore is recommended the depth of back opening be at a reasonable extent.Įnclosures of this type have the back of the baffles completely housed in a box of an appropriate size to prevent sounds from being radiated from the back of drivers, confining the back sound within the box. This fact suggests the possibility of appearance of strong peaks in reproduced sound if enclosures are excessively deep. Pipes present at the back of drivers will be a source of pipe size dependent resonance. Note must be taken, however, that backward bends sometimes function as a thick pipe.
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The idea is to make flat enclosures smaller to overcome the necessity of a larger size baffle for richer bass sound. This is to avoid disturbance of back sound by the walls.Īn open-back type enclosure can be attained if the edges of the flat type baffles are bent. This type of enclosure should be located rather distant from and not parallel to the walls. Some disadvantages that bass reproduction capability is not as good as other enclosure systems, which is inevitable with flat baffles, may be justified by the ease in building enclosures, and sound with openness.
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In applications of this method, drivers must be located off center of the baffle. The larger the baffle, the more advantageous is reproduction of bass sound because the back sound must go a longer roundabout distance before it can get to the front of the enclosure. Drivers are mounted on baffles of a certain size. Next, we will discuss representative enclosures.Ī baffle is the only means to isolate the front sound from the back sounds. There are many types of enclosures available where a variety of baffles are incorporated. The purpose of a baffle is to isolate the front sound from the back sound, which allows for bass sound to be audible. What will happen if drivers are driven unbaffled, or mounted to nothing? As illustrated, sounds radiated from the front and back of diaphragms cancel out each other, silencing bass sound. The sound radiated from the front and back of diaphragms is identical except that their phases are opposite. Drivers produce sound by their diaphragms moving back and forth to create compressional waves.