BASS-REFLEX SYSTEMS
In another, more popular arrangement, radiation from the rear of the cone is used to reinforce the front radiation rather than cancel it. This arrangement is shown in Fig. 5.6, and is known as the bass-reflex enclosure. It is the same as the closed box except that an opening is cut below the speaker. Which allows air to flow in and out of the box as the speaker cone moves back and forth.
Fig. 5.6 Port in bass reflex cabinet is cut so that back waves from speaker reinforce front waves at low frequencies.
Addition of the port adds acoustic inductance (inertance) to the load offered to the speaker by the cabinet, because ...
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