# US 10,873,803 B2 · Audio loudspeaker and related method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,803 B2 - Document ID: US10873803B2 - Status: Granted - Kind: B2 - Application number: 16/529,845 - Filed: 2019-08-02 - Published: 2020-03-19 - Granted: 2020-12-22 - Earliest claimed: 2018-09-13 - Assignees: Endow Audio, LLC - Applicants: Endow Audio, LLC - Inventors: David T. Strunk - Web page: https://patentgrep.com/patent/US10873803B2 ## CPC - H04R 1/2834: {for loudspeaker transducers} - H04R 5/02: Spatial or constructional arrangements of loudspeakers - H04R 1/025: {Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture} - H04R 1/227: {using transducers reproducing the same frequency band} - H04R 1/26: Spatial arrangements of separate transducers responsive to two or more frequency ranges - H04R 1/2819: {for loudspeaker transducers} - H04R 1/2826: {for loudspeaker transducers} - H04R 1/403: {loud-speakers} - H04R 7/20: Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands - H04R 9/046: {Construction} - 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 1/2873: {for loudspeaker transducers} - H04R 1/345: {for loudspeakers} - H04R 9/06: Loudspeakers - H04R 2201/403: Linear arrays of transducers - 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) ## Abstract An audio speaker includes an enclosure having a coupling chamber and a loading chamber, at least m radiating drivers, and at least one and no more than m−1 loading driver(s), wherein m is at least two. The coupling chamber acts to couple the at least m radiating drivers and the at least m−1 loading driver(s), for example, and the loading chamber acts to load the loading driver(s). The at least one and no more than m−1 loading driver(s) may have a higher sensitivity than the at least m radiating drivers and the at least m radiating drivers may be arranged within the enclosure to minimize a volume of the coupling chamber. In other embodiments, the at least one and no more than m−1 loading driver(s) may be other types of inducers (e.g., an undriven loading driver(s), a drone cone, a port, or combinations thereof). ## Claims ### Claim 1 An audio speaker, comprising: an enclosure including a sealed coupling chamber; at least m radiating drivers in communication with the coupling chamber; and at least one and no more than m−1 loading driver(s) in communication with the coupling chamber; wherein m is at least two and all radiating drivers in communication with the coupling chamber operate in common acoustic phase. ### Claim 2 (depends on 1) The audio speaker of claim 1, wherein the coupling chamber acts to couple a non-radiating face of the at least m radiating drivers and a face of the at least one and no more than m−1 loading driver(s). ### Claim 3 (depends on 2) The audio speaker of claim 2, wherein a loading chamber acts to load a face of the at least one and no more than m−1 loading driver(s). ### Claim 4 (depends on 1) The audio speaker of claim 1, wherein all radiating drivers radiate into a listening space. ### Claim 5 (depends on 1) The audio speaker of claim 1, wherein at least one of the at least one and no more than m−1 loading driver(s) communicates with a loading chamber. ### Claim 6 (depends on 5) The audio speaker of claim 5, wherein the loading chamber includes a port and wherein the at least one and no more than m−1 loading driver(s) is positioned at least partially within the loading chamber. ### Claim 7 (depends on 5) The audio speaker of claim 5, wherein the loading chamber includes a port and wherein the at least one and no more than m−1 loading driver(s) communicates with the coupling chamber. ### Claim 8 (depends on 5) The audio speaker of claim 5, wherein the loading chamber includes a drone cone and wherein the at least one and no more than m−1 loading driver(s) is positioned at least partially within the loading chamber. ### Claim 9 (depends on 5) The audio speaker of claim 5, wherein the loading chamber includes a drone cone and wherein the at least one and no more than m−1 loading driver(s) communicates with the coupling chamber. ### Claim 10 (depends on 1) The audio speaker of claim 1, wherein a volume of a loading chamber is substantially the same as a volume of the at least one and no more than m−1 loading driver(s). ### Claim 11 (depends on 1) The audio speaker of claim 1, wherein at least one of the at least one and no more than m−1 loading driver(s) is positioned at least partially within a loading chamber. ### Claim 12 (depends on 1) The audio speaker of claim 1, wherein at least one of the at least one and no more than m−1 loading driver(s) is larger in size than the at least m radiating drivers. ### Claim 13 (depends on 1) The audio speaker of claim 1, wherein the at least one and no more than m−1 loading driver(s) having a higher sensitivity than each of the at least m radiating drivers. ### Claim 14 (depends on 1) The audio speaker of claim 1, wherein the at least m radiating drivers are arranged within the enclosure to minimize a volume of the coupling chamber. ### Claim 15 (depends on 1) The audio speaker of claim 1, wherein the at least one and no more than m−1 loading driver(s) has a diameter at least as large as a diameter of each of the at least m radiating drivers and a sensitivity at least as high as a sensitivity of each of the at least m radiating drivers. ### Claim 16 (depends on 15) The audio speaker of claim 15, wherein the coupling chamber acts to couple a non-radiating face of the at least m radiating drivers and the at least one and no more than m−1 loading driver(s). ### Claim 17 (depends on 16) The audio speaker of claim 16, wherein a loading chamber acts to load a face of the at least one and no more than m−1 loading driver(s). ### Claim 18 (depends on 15) The audio speaker of claim 15, wherein each of the at least m radiating drivers radiate into a listening space. ### Claim 19 (depends on 15) The audio speaker of claim 15, wherein at least one of the at least one and no more than m−1 loading driver(s) communicates with a loading chamber. ### Claim 20 (depends on 15) The audio speaker of claim 15, wherein a volume of a loading chamber is substantially the same as a volume of the at least one and no more than m−1 loading driver(s). ### Claim 21 (depends on 15) The audio speaker of claim 15, wherein the at least one and no more than m−1 loading driver(s) is positioned at least partially within a loading chamber. ### Claim 22 (depends on 15) The audio speaker of claim 15, wherein at least one of the at least one and no more than m−1 loading driver(s) is larger in size than the at least m radiating drivers. ### Claim 23 (depends on 15) The audio speaker of claim 15, wherein a loading chamber includes one of a port or a drone cone. ### Claim 24 (depends on 15) The audio speaker of claim 15, wherein a loading chamber includes a port and wherein at least one of the at least one and no more than m−1 loading driver(s) is positioned at least partially within the loading chamber. ### Claim 25 (depends on 15) The audio speaker of claim 15, wherein a loading chamber includes a port and wherein at least one of the at least one and no more than m−1 loading driver(s) communicates with the coupling chamber. ### Claim 26 (depends on 15) The audio speaker of claim 15, wherein a loading chamber includes a drone cone and wherein at least one of the at least one and no more than m−1 loading driver(s) is positioned at least partially within the loading chamber. ### Claim 27 (depends on 15) The audio speaker of claim 15, wherein a loading chamber includes a drone cone and wherein at least one of the at least one and no more than m−1 loading driver(s) communicates with the coupling chamber. ### Claim 28 (depends on 1) The audio speaker of claim 1, wherein all radiating drivers in communication with the coupling chamber are mounted and electrically connected so as to be in the same acoustic polarity.