An Explanation of Frequency Ports for Designing Loudspeakers

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Frequency ports are an important design element of loudspeakers. They affect the frequency response of the speaker significantly. These ports are small holes inside the enclosure of the speaker as well as a tube which is inserted into the hole and extends towards the inner of the speaker.

Through the frequency port mostly low-frequency waves are emitted. The diameter and the length of the plastic tube of the frequency port affects the frequency response. Usually the lower the diameter of the port the more linear the frequency response of the speaker. During the design of a loudspeaker, you should experiment with the location as well as the diameter and length of support. The location of support is not that critical. However, the diameter and length of support will affect the speaker quite a bit.

Some …