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It is also interesting to note that contrary to what one might think, the bigger the diameter of port you use (bigger Av), the longer the port has to be (assuming box volume and tuning frequency are constant). Notice that the volume of the port does not come into play. Vb is the enlcosure's net volume (in cubic inches). Lv is the length of the port (in inches) and Where Av is the cross-sectional area of the port (in square inches),
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It is a common misconception that the tuning frequency ( Fb) is a function of port volume when, in fact, it is actually a function of the port's cross-sectional area and its length as given by the formula: These two methods involve the use of a port, generally made from a simple piece of PVC pipe, or a duct (sometimes called a slot port), which is normally constructed out of the same material the box is made of (normally wood).īefore we can discuss how to make a port, it is important to know what factors affect the tuning frequency of the enclosure. When tuning a ported enclosure, there are two widely used methods implemented.