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Chapter 15: Subwoofer Crossovers > 15.2 Subwoofer Technologies

15.2  Subwoofer Technologies

A wide variety of types of loudspeaker enclosure are used in subwoofers. The relatively small frequency range that has to be covered allows techniques such as bandpass enclosures to be used when they would not be usable with LF or MID drive units. The main types are:

Sealed (Infinite baffle)

Reflex (ported)

Transmission line

Bandpass

Isobaric

Dipole

Horn-loaded

The first two of these are by far the most popular. While I have not done a comprehensive survey, it seems clear that sealed enclosures are more popular than ported types, which is perhaps surprising given the greater bass extension possible with ported enclosures. Brief descriptions of the operation of each type are given below; I have kept them fairly short as many aspects are covered in Chapter 2 on loudspeakers.


  

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