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1. (WO2019063070) LOUDSPEAKER ARRANGEMENT
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CLAIMS:

1 . A loudspeaker arrangement comprising:

an air-tight, rigid, t h ermo-conductive enclosure with an aperture and an outer surface;

a loudspeaker air-tightly mounted in the aperture to form a locked acoustic volume within the enclosure; and

a multiplicity of thermo-conductivc fins attached to or integrated in the enclosure at the outer surface thereof; the multiplicity of fins being distributed over the outer surface of the enclosure.

2. The arrangement of claim 1 , wherein number and size of the fins is such that the area of the outer surface of the enclosure is enlarged by the fins by at least 50%.

3. The arrangement of claim 1 or 2, wherein the fins have the shape of ribs or nobs.

4. The arrangement of any of claims 1 to 3, wherein the enclosure is connected to a coupling dev ice, the coupling device having a housing with two apertures, one of the two apertures hav ing a position that corresponds to the aperture of the enclosure.

5. The arrangement of claim 4, wherein the coupling device is made from or comprises a thermal insulating material.

6. The arrangement of claim 4 or 5, wherein the coupling device is connected to the enclosure via a thermal insulating device.

7. The arrangement of claim 6, wherein the loudspeaker is connected to the enclosure via the thermal insulating dev ice.

8. The arrangement of any of claims 1 to 7, further comprising a heat shield configured to block transmission of heat to the enclosure.

9. The arrangement of any of claims 1 to 8, further comprising an airstream duct configured to guide an airstream to the enclosure.

10. The arrangement of any of claims 1 to 9, wherein the enclosure has a shape identical or similar to a cup.

1 1. An active noise control system comprising:

a reference sensor configured to provide a reference signal representative of noise from a noise source;

an error sensor configured to provide an error signal representative of sound occurring at a position to be silenced;

a noise control ler electrical ly connected to the reference sensor and the error sensor, and configured to provide a noise cancel l ing signal; and

a loudspeaker arrangement according to any of claims 1 to 10. the loudspeaker arrangement configured to receive the noise cancelling signal from the noise controller and to generate noise cancell ing sound, and disposed so that the noise cancel ling sound is broadcasted to the position to be silenced.

12. The system of claim 1 1 , wherein at least one of the reference sensor and the error sensor is a microphone.

13. The system of claim 1 1 , wherein the reference sensor is a non-acoustical sensor.

14. The system of any of claims 1 1 to 13, further comprising:

a first pipe- 1 ike duct configured to transmit the noise;

a second pipe-like duct configured to transmit the cancelling noise; and a y-pipc connected to the first pipe- 1 ike duct and the second pipe-like duct, the y-pipc configured to superimpose the noise and the cancelling noise.