Thứ Năm, ngày 09 tháng 9 năm 2010

What does "tuning" of an enclosure or port mean? What does "tuning" of an enclosure or port mean? Have you ever blown over the top of a bottle and heard the note it produces? Have you ever changed that note by adding or pouring out liquid? A vented loudspeaker enclosure works under a similar principle. When liquid is added to or poured out of a bottle, its internal air volume is changed and the resonant note is raised or lowered. Enclosure tuning is affected by the ratio of air volume in the duct/port (equivalent to a bottles bottleneck) to the enclosures interior volume. Tuning of a loudspeaker enclosure is the result of manipulating the difference in effective air mass between the enclosure interior and the air in the duct. The bottle-like nature of a vented enclosure is known as a "Helmholtz Resonator". The vents/ducts in a vented enclosure work only over a narrow band of frequencies near the chosen tuned frequency, producing the same effect as when blowing across a bottleneck.

What does "tuning" of an enclosure or port mean?


What does "tuning" of an enclosure or port mean?
Have you ever blown over the top of a bottle and heard the note it produces? Have you ever changed that note by adding or pouring out liquid? A vented loudspeaker enclosure works under a similar principle. When liquid is added to or poured out of a bottle, its internal air volume is changed and the resonant note is raised or lowered. Enclosure tuning is affected by the ratio of air volume in the duct/port (equivalent to a bottles bottleneck) to the enclosures interior volume. Tuning of a loudspeaker enclosure is the result of manipulating the difference in effective air mass between the enclosure interior and the air in the duct. The bottle-like nature of a vented enclosure is known as a "Helmholtz Resonator". The vents/ducts in a vented enclosure work only over a narrow band of frequencies near the chosen tuned frequency, producing the same effect as when blowing across a bottleneck.

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