Loudspeaker device having foam insert to improve gas distribution in sound adsorber material
View Patent ↗A loudspeaker device having housing and an acoustic transducer is disclosed. The housing has a transducer space for the acoustic transducer, and a back volume space. The back volume filled with a sound adsorber material and a foam material. The sound adsorber material in the back volume space is configured to virtually increase the size of the back volume space, and shift the resonant frequency of the back volume space. The foam material separates the sound adsorber from the transducer space and facilitates gas exchange and air flow within the back volume space and between the sound adsorber and the transducer space. The foam material is configured in different arrangements to facilitate the gas exchange and air flow.
1. A loudspeaker device comprising:
a loudspeaker housing comprising a transducer volume and a preconfigured back volume, wherein the transducer volume and the back volume are acoustically coupled;
a transducer mounted in the transducer volume;
a charging port disposed in the portion of the loudspeaker housing where the preconfigured back volume is located;
a preconfigured foam insert disposed in the preconfigured back volume, wherein the preconfigured foam insert separates the preconfigured back volume from the transducer volume and defines a cavity within the preconfigured back volume; and
an amount of sound adsorber material disposed within the cavity defined by the preconfigured foam insert,
wherein gas exchange between the transducer volume and the back volume is facilitated by the preconfigured foam insert.
2. A loudspeaker device according to claim 1 , wherein a portion of the preconfigured foam insert is disposed along an interior surface of the back volume.
3. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert is arranged such that the back volume is divided into two cavities.
4. A loudspeaker device according to claim 3 , wherein the transducer housing further comprises a charging port for each of the cavities.
5. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert has a triangular shape.
6. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert has a complex polygon shape.
7. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert has a shape having at least one curved surface.
8. A loudspeaker device according to claim 1 , wherein the sound adsorber material comprises a substantially spherically shaped zeolite-based material having a mean diameter of at least 300 microns.
9. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert is L-shaped.
10. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert is T-shaped.
11. A loudspeaker device according to claim 1 , wherein the preconfigured foam insert has an acoustic resistance of 260 MKS rayls or less.