Speaker unit for low frequency reproduction

Details Speaker unit for low frequency reproduction Speaker unit for low frequency reproduction

2005-10-18

2005-10-18

San Martin, Edgardo (Department: 2837)

Acoustics

Diaphragm and enclosure

Reflex baffle

C181S199000, C381S349000, C381S338000

Reexamination Certificate

active

06955241

ABSTRACT:
The invention provides a speaker unit for low frequency reproduction wherein distortion is reduced and the orientation of a sound image of the lower side frequency region is augmented. To that end, the phase characteristic in an actually used frequency band is made substantially flat. The speaker unit includes a speaker enclosure, a duct formed in the speaker enclosure and having a port thereon, and a speaker mounted in the speaker enclosure. The speaker is formed such that it has a first resonance frequency set higher than a higher side frequency of the actually used frequency band (about 20 Hz to 100 Hz), while the port is formed such that it has a second resonance frequency set lower than a lower side frequency of the actually used frequency band. For example, the speaker includes a vibrating system having a reduced mass or a reduced compliance with which the first resonance frequency is set higher than the higher side frequency of the actually used frequency band, and the duct has an increased length or a controlled cross sectional area with which the second resonance frequency is set lower than the lower side frequency of the actually used frequency band.

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