Speaker Box Cavity Extension for Low-Frequency Response
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Solution Overview
Problem
Existing speaker boxes for mobile devices waste space by not extending the second rear cavity, which is filled with sound-absorbing particles, to the side of the front cavity, limiting their acoustic performance.
Innovation Solution
The speaker box design includes a cover plate that extends the second rear cavity below the front cavity, filled with sound-absorbing particles, and uses air-permeable isolating members to communicate between cavities, enhancing airflow and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the second rear cavity is located only on one side of the first rear cavity without extending to the front cavity side, then the structure is simple, but the space utilization is poor and acoustic performance is limited
Solution Approach 1:
The second rear cavity is extended from a single-side configuration to a multi-dimensional arrangement that reaches the front cavity side, effectively utilizing the thickness direction and lateral space. This dimensional expansion increases the volume of the second rear cavity without proportionally increasing structural complexity, as the extension follows the natural spatial layout of the speaker box.
Solution Approach 2:
The second rear cavity is nested within the overall accommodating space formed by the upper cover, lower cover, and sound unit, with the air-permeable isolating member creating a nested enclosure for sound-absorbing particles. This nested arrangement allows the second rear cavity to occupy otherwise unused space near the front cavity while maintaining a compact overall structure.
2Volume of moving object
If the second rear cavity does not extend to the front cavity side, then manufacturing is simple, but space is wasted and acoustic performance suffers
Solution Approach 1:
The accommodating space is segmented into multiple functional cavities: the first rear cavity, the second rear cavity extended to the front cavity side, and the front cavity itself. The air-permeable isolating member further segments the second rear cavity by enclosing sound-absorbing particles. This segmentation allows each region to be optimized for its specific acoustic function while being manufactured as an integrated structure.
Solution Approach 2:
The extended second rear cavity serves multiple functions: it increases the volume for sound-absorbing particles to improve low-frequency response, utilizes otherwise wasted space near the front cavity, and maintains structural integration with the housing. This multi-functional design achieves space optimization without requiring separate manufacturing steps for each function.
3Reliability
If sound-absorbing particles are enclosed by air-permeable isolating member, then acoustic performance improves, but device complexity increases
Solution Approach 1:
An air-permeable isolating member made of porous material is used to enclose the sound-absorbing particles in the second rear cavity. The porous structure allows acoustic waves to penetrate and interact with the sound-absorbing particles, improving low-frequency acoustic performance. The isolating member maintains its structural form while permitting acoustic energy transmission, achieving enhanced performance without requiring complex active control systems.
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
This design optimizes the use of space within the speaker box, improving low-frequency acoustic performance and overall audio quality by enlarging the volume of the second rear cavity and facilitating better airflow between cavities.
Implementation Method 1
The second rear cavity is filled with sound-absorbing particles
Implementation Method 2
the sound-absorbing particles are enclosed in the second rear cavity by the air-permeable isolating member
Data Source
AI summary
The present disclosure discloses a speaker box which includes an upper cover, a lower cover fixed to the upper cover in a covering manner and forming an accommodating space with the lower cover, and a sound unit accommodated in the accommodating space. The sound unit and the upper cover define a front cavity. The sound unit, the lower cover and the upper cover define a rear cavity together. The speaker box further includes a cover plate fixed to one side of the upper cover away from the lower cover, and an air-permeable isolating member. The cover plate and the upper cover are separated and define an auxiliary cavity which is filed with sound-absorbing particles. The air-permeable isolating member is fixed to the upper cover and completely covers the through hole, and the air-permeable isolating member encloses the sound-absorbing particles in the auxiliary cavity.