Parallel Loudspeaker Diaphragms Facing Each Other for Acoustic Cavity
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Solution Overview
Problem
Traditional loudspeaker systems face limitations in low-frequency response and efficiency, requiring a large box and additional power amplification to achieve higher sound pressure levels.
Innovation Solution
A loudspeaker system comprising multiple woofers arranged in parallel within a box, with each woofer having a frame, diaphragm, and voice coil, where the diaphragms face each other, forming a sound cavity in communication with the outside through a waveguide tube, and connected in series with a capacitor, mounted on a bracket within the box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional independent loudspeaker mounting is used, then the structure is simple, but the low-frequency response is limited and efficiency is low
Solution Approach 1:
Multiple loudspeakers are merged into a unified system with shared acoustic space. The diaphragms of multiple loudspeakers face each other and share a common acoustic cavity, creating an integrated acoustic system that improves efficiency while maintaining manageable structural complexity through standardized mounting brackets.
Solution Approach 2:
The loudspeaker drivers are nested within a compact acoustic cavity structure. The acoustic cavity is formed between the facing diaphragms and enclosed by the box and bracket, creating a nested configuration where multiple components occupy shared spatial volume efficiently.
2Productivity
If box volume is increased to improve low-frequency response, then low-frequency output improves, but the system size increases
Solution Approach 1:
The acoustic cavity utilizes the vertical dimension between facing diaphragms rather than expanding the horizontal box volume. By orienting diaphragms to face each other with the cavity formed in the space between them, the system achieves effective acoustic volume without increasing the overall footprint of the speaker system.
Solution Approach 2:
The acoustic cavity is nested within the existing box structure, utilizing the space between facing diaphragms mounted on opposite sides of the box. This nested configuration maximizes the use of available internal volume without requiring external expansion of the box.
3Power
If power amplifier is increased to improve sound pressure level, then output sound pressure level increases, but energy consumption increases
Solution Approach 1:
The system utilizes mechanical resonance and acoustic cavity resonance to amplify sound output. The enclosed acoustic cavity between facing diaphragms creates resonant conditions that enhance sound pressure level naturally through acoustic physics rather than requiring proportional increases in electrical power input.
Solution Approach 2:
The configuration converts what would normally be wasted acoustic energy (sound waves traveling in opposite directions from independent speakers) into useful resonant energy within the enclosed cavity. The facing diaphragms create acoustic pressure that resonates within the cavity, transforming potential energy loss into beneficial sound reinforcement.
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 configuration enhances low-frequency output and efficiency, allowing for improved sound pressure levels without the need for a large box, effectively increasing the loudspeaker system's performance.
Implementation Method 1
each of the loudspeakers further comprises a capacitor, and the capacitor and the voice coil are connected in series
Implementation Method 2
a voice coil for driving a vibration of the diaphragm
Implementation Method 3
a sound cavity is formed among the front surfaces of the diaphragms, and the sound cavity is in communication with the outside of the box
Data Source
AI summary
A loudspeaker system, having a good low-frequency response without a large box and effectively improving the efficiency of the loudspeaker system, so as to increase the output sound pressure level of the system, comprises a box and a plurality of loudspeakers arranged in the box and connected in parallel with each other, wherein each of the loudspeakers comprises a frame, a diaphragm arranged on the frame, and a voice coil for driving a vibration of the diaphragm; front surfaces of the diaphragms of the loudspeakers are arranged to face each other; a sound cavity is formed among the front surfaces of the diaphragms, and the sound cavity is in communication with the outside of the box; and each of the frames is located between a rear surface of its corresponding diaphragm and an inner wall of the box.