Ceiling Speaker Assembly Horn Cavity Acoustic Impedance
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Solution Overview
Problem
Existing loudspeaker assemblies installed in surfaces like ceilings fail to satisfy physical constraints such as strength, fire resistance, seismic stability, and aesthetics while also lacking enhanced acoustic impedance matching.
Innovation Solution
A loudspeaker assembly is designed with a ribbed frame defining a driver housing, horn, and conformal portions, featuring a driver aperture, port aperture, and a rear baffle with a porous material to create a horn cavity with increasing cross-sectional area, along with a grille that binds the frame to the baffle, enhancing acoustic impedance and maintaining desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional loudspeaker assembly is installed in a ceiling surface, then the installation is simple, but the acoustic performance is poor and physical constraints (strength, fire resistance, seismic stability) are not satisfied
Solution Approach 1:
The loudspeaker assembly is divided into separate functional components: a driver housing portion containing the speaker driver, a horn portion for acoustic impedance matching, and a conformal portion for surface integration. This segmentation allows each component to be optimized independently while maintaining overall system performance and meeting physical constraints.
Solution Approach 2:
The invention transitions from traditional two-dimensional mounting plates to a three-dimensional formed structure with depth variations. The horn portion extends backward to provide acoustic volume, while the conformal portion integrates with ceiling surfaces, adding dimensional complexity that enables both improved acoustics and structural integrity.
2Volume of moving object
If a smaller speaker driver is used, then the assembly size is reduced, but the acoustic output and efficiency are insufficient
Solution Approach 1:
A horn portion is introduced as an intermediary acoustic structure between the small speaker driver and the surrounding air. The horn's flared geometry provides acoustic impedance matching, allowing the small driver to efficiently transfer acoustic energy to the air, thereby achieving high acoustic output and efficiency without requiring a large driver.
3Strength
If a solid rear baffle is used, then structural strength is improved, but acoustic impedance matching and sound dispersion are reduced
Solution Approach 1:
The rear baffle is designed with spatially varying properties: it is solid in regions requiring structural strength and fire resistance, while incorporating porous or perforated sections in areas where acoustic impedance matching is needed. This local differentiation allows the single component to simultaneously satisfy both structural and acoustic requirements.
Solution Approach 2:
The rear baffle utilizes composite construction combining solid structural materials with porous or acoustic treatment materials. This composite approach enables the baffle to provide both mechanical strength for structural integrity and acoustic properties for impedance matching and sound dispersion.
4Weight of stationary object
If the loudspeaker assembly is made lightweight, then ease of installation is improved, but structural integrity and seismic stability are compromised
Solution Approach 1:
The assembly employs composite materials that provide high strength-to-weight ratios. Lightweight alloys or composite structures are used in non-critical areas, while strategic reinforcement with higher-strength materials is applied only where structural integrity and seismic resistance are required, achieving both lightweight construction and stability.
Solution Approach 2:
The conformal portion of the assembly is designed to integrate with and distribute loads across the ceiling surface structure. By conforming to the surface geometry and utilizing the supporting structure, the assembly counteracts gravitational and seismic forces without requiring excessive self-weight, thereby achieving stability through structural integration rather than mass.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved acoustic performance, increased efficiency, and wider sound dispersion, allowing a smaller driver to function like a larger one, while maintaining structural integrity and aesthetic appeal, and can be easily installed in various surfaces.
Implementation Method 1
The horn cavity has an increasing cross sectional area as the distance from the driver housing portion increases
Implementation Method 2
The rear baffle is formed from a porous material such that the rear baffle defines the horn cavity wall to be a porous horn cavity wall
Data Source
AI summary
A ceiling speaker assembly is disclosed. In one or more embodiments, the ceiling speaker assembly includes a three-dimensional support frame attached to a perforated grille. The support frame is configured with a speaker aperture adjacent to which a speaker is mounted and a port aperture. The speaker aperture and port aperture are configured such that the speaker aperture is in communication with the front of the speaker and the port aperture is in communication with the rear of the speaker. In one or more embodiments, the support frame includes a horn cavity that functions as an acoustical cross-over such that higher frequencies generated by the speaker are emitted primarily through the speaker aperture and the lower frequencies generated by the speaker are emitted primarily through the port aperture.