# US 11,445,302 B2 · Dual loudspeaker enabled cooling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,302 B2 - Document ID: US11445302B2 - Status: Granted - Kind: B2 - Application number: 17/086,716 - Filed: 2020-11-02 - Published: 2021-02-18 - Granted: 2022-09-13 - Earliest claimed: 2018-11-27 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Michael B. Nussbaum; Jason C. Della Rosa; Glenn K. Trainer - Web page: https://patentgrep.com/patent/US11445302B2 ## CPC - H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges - H04R 9/022: {Cooling arrangements} - H04R 1/025: {Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture} - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - H05K 7/20127: {Natural convection} - H04R 1/2853: {using an acoustic labyrinth or a transmission line} - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract Electronics devices according to embodiments of the present technology may include a first loudspeaker and a second loudspeaker disposed in a housing. The housing may define a first internal volume between a first end of the housing and a backside of the first loudspeaker. The housing may define a second internal volume between a second end of the housing and a backside of the second loudspeaker. The first loudspeaker and the second loudspeaker may be positioned within the housing so a front side of the first loudspeaker faces a front side of the second loudspeaker. A duct may be defined by the housing, which may access the first internal volume at a first end and may access the second internal volume at a second end. The electronic device may also include a processor configured to deliver signals to the first loudspeaker and the second loudspeaker. ## Claims ### Claim 1 An electronic device comprising: a first loudspeaker; a second loudspeaker; a sealed enclosure in which the first loudspeaker and the second loudspeaker are disposed, wherein: the sealed enclosure defines a first internal volume between a first end of the sealed enclosure and a backside of the first loudspeaker; the sealed enclosure defines a second internal volume between a second end of the sealed enclosure and a backside of the second loudspeaker; and the first loudspeaker faces the second loudspeaker; and a duct defined by the sealed enclosure, the duct accessing the first internal volume at a first end of the duct and accessing the second internal volume at a second end of the duct. ### Claim 2 (depends on 1) The electronic device of claim 1, wherein the first loudspeaker and the second loudspeaker are axially aligned. ### Claim 3 (depends on 1) The electronic device of claim 1, wherein the first internal volume and the second internal volume are of dissimilar size. ### Claim 4 (depends on 1) The electronic device of claim 1, further comprising a plurality of ducts extending between the first internal volume and the second internal volume. ### Claim 5 (depends on 1) The electronic device of claim 1, further comprising a processor incorporated within the electronic device, the processor configured to deliver signals in a first mode that operates the first loudspeaker in phase with the second loudspeaker to produce an audio output from the electronic device. ### Claim 6 (depends on 5) The electronic device of claim 5, wherein the processor is configured to deliver signals in a second mode that operates the first loudspeaker out of phase with the second loudspeaker. ### Claim 7 (depends on 6) The electronic device of claim 6, wherein the signals delivered in the second mode are at frequencies below about 20 Hz. ### Claim 8 (depends on 6) The electronic device of claim 6, wherein signals delivered in the second mode are configured to produce airflow from the duct within the first internal volume or the second internal volume. ### Claim 9 (depends on 8) The electronic device of claim 8, wherein the airflow is characterized by a velocity at the first end of the duct of greater than or about 1 m/s. ### Claim 10 (depends on 6) The electronic device of claim 6, wherein the processor is further configured to operate in the first mode and the second mode simultaneously. ### Claim 11 An audio system comprising: a sealed enclosure; a first loudspeaker disposed in the sealed enclosure and at least partially defining a first internal volume of the sealed enclosure; a second loudspeaker disposed in the sealed enclosure and at least partially defining a second internal volume of the sealed enclosure, wherein the first loudspeaker faces the second loudspeaker; and a duct extending between the first internal volume of the sealed enclosure and the second internal volume of the sealed enclosure. ### Claim 12 (depends on 11) The audio system of claim 11, wherein the first loudspeaker and the second loudspeaker are disposed within the sealed, and wherein the first loudspeaker and the second loudspeaker are axially aligned. ### Claim 13 (depends on 11) The audio system of claim 11, wherein the first loudspeaker and the second loudspeaker are similarly sized woofers. ### Claim 14 (depends on 13) The audio system of claim 13, wherein the first loudspeaker and the second loudspeaker are each characterized by a maximum excursion of at least about 5 mm. ### Claim 15 (depends on 11) The audio system of claim 11, further comprising: a processor, and memory having stored therein instructions which when executed by the processor: deliver a first signal to the first loudspeaker; deliver a second signal to the second loudspeaker causing the second loudspeaker to operate out of phase with the first loudspeaker causing airflow within the sealed enclosure; deliver a third signal to the first loudspeaker; and deliver a fourth signal to the second loudspeaker causing the second loudspeaker to operate in phase with the first loudspeaker causing audio output from the audio system. ### Claim 16 (depends on 15) The audio system of claim 15, wherein delivery of the second signal to the second loudspeaker and delivery of the fourth signal to the second loudspeaker overlap in time. ### Claim 17 (depends on 15) The audio system of claim 15, wherein the first signal and the second signal are each at a frequency below or about 20 Hz. ### Claim 18 An electronic device comprising: a first loudspeaker; a second loudspeaker; a sealed housing in which the first loudspeaker and the second loudspeaker are disposed, wherein: the sealed housing defines a first internal volume between a first end of the sealed housing and the first loudspeaker; the sealed housing defines a second internal volume between a second end of the sealed housing and the second loudspeaker; and the first loudspeaker faces the second loudspeaker; and a duct defined by the sealed housing, the duct accessing the first internal volume at a first end of the duct and accessing the second internal volume at a second end of the duct. ### Claim 19 (depends on 18) The electronic device of claim 18, further comprising: a processor configured to deliver signals in a cooling mode that operates the first loudspeaker out of phase with the second loudspeaker, wherein the processor is further configured to deliver signals in an audio mode that operates the first loudspeaker in phase with the second loudspeaker to produce an audio output from the electronic device. ### Claim 20 (depends on 19) The electronic device of claim 19, wherein the processor is configured to deliver signals in the cooling mode and signals in the audio mode simultaneously.