Loudspeaker Port With Flared Extension Wall
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Solution Overview
Problem
Conventional loudspeaker designs often fail to effectively project sound across a wide frequency range and enhance low-frequency response due to limitations in transducer configuration and port design, leading to suboptimal sound distribution and resonance.
Innovation Solution
A loudspeaker assembly featuring a combination of a compression driver and a woofer transducer within an enclosure, coupled with an acoustic horn and a mounting baffle that forms a port for fluid communication, optimizing sound projection and low-frequency response through a flared port structure that includes an extension wall and rearward projection for enhanced sound directionality and resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional loudspeaker design uses standard transducer configuration and port design, then the structure is simple, but the sound projection across wide frequency range and low-frequency response are insufficient
Solution Approach 1:
The patent combines a compression driver and woofer transducer in a single enclosure, merging high-frequency and low-frequency sound production into one integrated system. The acoustic horn is coupled with the compression driver while the woofer is positioned within the same enclosure, allowing both transducers to work together for wide frequency range projection.
Solution Approach 2:
The port design incorporates a rearward projection extending from the acoustic horn in a direction transverse to the forward direction, creating a three-dimensional port structure. This dimensional extension increases the effective port length and improves low-frequency response without significantly increasing the frontality footprint.
2Reliability
If the port length is extended to improve low-frequency response, then the resonance is enhanced, but the enclosure size increases
Solution Approach 1:
The port is extended in a transverse direction through the rearward projection rather than solely increasing the front-to-back length. This lateral extension allows the port to achieve greater effective length for improved low-frequency response while minimizing the increase in overall enclosure volume.
Solution Approach 2:
The rearward projection is positioned to extend into the space between the acoustic horn and the enclosure front panel, utilizing available internal volume. The extension wall depends from the acoustic horn and lies in front of the woofer assembly, nesting the port extension within the existing enclosure geometry.
3Strength
If the wall thickness of the extension wall is increased to support the grille, then the grille deflection is reduced, but the port flow area is reduced
Solution Approach 1:
The extension wall has non-uniform thickness distribution, with the front surface providing enhanced structural support for the grille while the rear portions maintain sufficient thickness for structural integrity. The local quality variation allows the wall to provide maximum grille support where needed without unnecessarily reducing the overall port flow area.
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 sound projection and low-frequency response by directing sound effectively across a wide frequency range, enhancing the overall acoustic performance and resonance of the speaker assembly.
Implementation Method 1
an acoustic horn coupled with the first transducer. The acoustic horn has a front surface configured to direct the sound from the first transducer
Implementation Method 2
a port establishing fluid communication along a port length between the interior of the enclosure and an outside environment
Implementation Method 3
optimizing sound projection and low-frequency response through a flared port structure that includes an extension wall and rearward projection for enhanced sound directionality and resonance
Data Source
AI summary
A loudspeaker assembly includes an enclosure defining a direction for projecting sound, a first transducer and a second transducer positioned within the enclosure, an acoustic horn coupled with the first transducer, a mounting baffle secured to the enclosure for supporting the second transducer, and a port establishing fluid communication along a port length between the interior of the enclosure and an outside environment in front of the open front side of the enclosure. The acoustic horn has a surface facing an interior of the enclosure. A forward portion of the port is formed by a forward face of the mounting baffle and an extension wall depending from the acoustic horn in a direction transverse to the direction. The port length is extended by a rearward port portion formed by a rearward extending flange of the mounting baffle and a rearward projection extending from the surface of the acoustic horn.