The composite acoustic panel comprises materials having different spectra of acoustic absorption.

An acoustical panel (10) for reducing acoustic noise is disclosed.

The at least one sound panel forms an expandable speaker system with the sound chamber when the at least one sound panel is held in the first position.

An acoustical panel is made by applying a thin, acoustically- transparent coating to an acoustical base mat.

The acoustic panel has a transaxial stiffness-compliance such that the panel is permitted to pump when low frequency acoustic energy is applied to the panel for the purpose of dissipating acoustic energy.

A loudspeaker unit comprising a frame (1), an acoustic panel (3), an electric exciter (5) for exciting the acoustic panel, and a tuning element (7).

The subject of the invention is also a method of producing such a structure, an acoustic panel comprising such a structure, and a nacelle comprising such an acoustic panel.

For the formation of bending waves in the acoustic panel (11), it is essentially important that the drivers (12) do not unnecessarily rigidize the acoustic panel (11).

A method is disclosed for manufacturing the acoustic panel.

The acoustic panel can be designed to absorb unwanted noise.

The device further comprises a sound chamber holding the at least one sound panel in a first position.

The annular acoustic panel (46) extends from a forward portion of the inlet section (34) to a forward portion of the main section (38) such that the bulkhead (42) is covered by the annular acoustic panel (46).

The device comprises a housing, at least one sound panel slidably coupled to the housing, and at least one speaker mounted on the at least one sound panel.

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An acoustic panel that provides precise reproduction of acoustic signal by means of mechanical vibrations in a wide range of acoustic signal frequency modulation.