Monocoque Speaker Enclosure Curved Ribs
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Solution Overview
Problem
Traditional speaker enclosures suffer from distortion due to sharp edges, diffraction, standing waves, and mechanical vibrations, which affect sound reproduction, especially at low frequencies, and existing solutions like European Patent No. 1 220 568 fail to provide an acoustically superior moulded monocoque speaker enclosure.
Innovation Solution
A monocoque speaker enclosure is formed with a single, integral outer shell and a thin inner shell, using injection moulding to create load-bearing structures within the outer shell, eliminating sharp edges and corners, and incorporating ribs with smoothly curved cross sections to reduce distortion and enhance structural rigidity, while additive manufacturing allows for complex shapes and improved sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional hollow wooden box enclosures with sharp edges are used, then manufacturing is simple, but sound distortion occurs due to diffraction and standing waves
Solution Approach 1:
The patent applies curvature by replacing sharp edges and corners with rounded contours throughout the enclosure structure. The front baffle, side panels, and internal bracing elements all feature curved transitions instead of abrupt angular changes. This eliminates diffraction of sound waves at edges while maintaining structural integrity and aesthetic appeal, directly resolving the contradiction between simple manufacturing and sound quality.
2Ease of manufacture
If parallel sides are used in the enclosure, then construction is straightforward, but standing waves are created inside the enclosure causing energy loss
Solution Approach 1:
The patent introduces asymmetry by varying the spacing between opposing enclosure panels and using irregular internal bracing patterns. The side panels are positioned at non-uniform distances from the front and rear baffles, and diagonal bracing elements create asymmetric support structures. This disrupts standing wave formation by preventing parallel resonance paths while maintaining straightforward construction methods.
3Object-affected harmful factors
If a large rigid panel with infinite space behind it is used for mounting, then sound reflection is eliminated, but the speaker becomes too large for domestic settings
Solution Approach 1:
The patent implements nested damping structures by placing sound-absorbing material within recessed cavities and channels formed into the enclosure panels themselves. The front baffle contains internal damping chambers, and the rear mounting panel features integrated acoustic absorption paths. This nested approach provides effective sound reflection control within compact dimensions suitable for domestic environments.
4Ease of manufacture
If traditional moulding techniques with pre-made inner plastic mould shells are used, then manufacturing is established, but acoustically superior speaker cavity cannot be achieved
Solution Approach 1:
The patent merges the mould structure with the final enclosure product by using the injection mould itself as the enclosure shell. The moulding process directly forms the complete speaker enclosure with integrated mounting panels, bracing elements, and acoustic damping features all in one piece. This eliminates the need for separate inner mould shells and assembly steps, achieving both manufacturing efficiency and superior acoustic performance through integrated design.
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 significantly reduces distortion and energy loss by eliminating vibrations and reflections, providing superior sound reproduction with improved structural rigidity and aesthetic appeal, while being cost-effective due to reduced material usage and simplified manufacturing.
Implementation Method 1
mechanical vibration induced by the motion and inertia of the speaker cone is transmitted and amplified where the reproduced frequencies stimulate, align or interact with the resonant frequencies of the enclosure structure or cavity
Implementation Method 2
sound reflected from the inner surfaces of the speaker enclosure: it is well known that the reflected sound wave, which is created by sound transmitted from the back of the speaker, is out of phase with the sound broadcast out the front of the speaker
Implementation Method 3
mechanical vibration induced by the motion and inertia of the speaker cone is transmitted and amplified where the reproduced frequencies stimulate, align or interact with the resonant frequencies of the enclosure structure or cavity
Implementation Method 4
sharp edges within and around the speaker enclosure could produce distortion to the sound being broadcast due to diffraction of the sound wave around the edge
Implementation Method 5
A monocoque speaker enclosure is formed with a single, integral outer shell and a thin inner shell, using injection moulding to create load-bearing structures within the outer shell
Implementation Method 6
additive manufacturing allows for complex shapes and improved sound absorption
Data Source
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AI summary
A method of forming an enclosure for an audio speaker including the steps of forming a rigid inner shell for the enclosure, the inner shell being in a single piece and configured to accept the speaker; and forming an outer shell for the enclosure, the outer shell having an inner surface bounded by the rigid inner shell, wherein the outer shell is a single piece monocoque construction which includes all the load bearing structures of the enclosure.