Dual Asymmetric Compression Driver Diaphragm Design
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Solution Overview
Problem
Conventional compression drivers face limitations in high-frequency range due to diaphragm assembly moving mass, air compliance, and voice coil inductance, leading to irregular high-frequency responses and nonlinear distortion, which deteriorate sound quality.
Innovation Solution
A dual asymmetric compression driver design featuring two annular diaphragms with different clamping distances and mechanical tuning for specific frequency ranges, optimized for mid-range and high-frequency outputs, with each diaphragm assembly having distinct moving masses and suspension compliances, and acoustically connected phasing plugs to extend the frequency range and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single diaphragm assembly is used in a compression driver, then the structure is simple, but the high-frequency range is limited and nonlinear distortion increases
Solution Approach 1:
The compression driver is divided into two separate diaphragm assemblies (first and second annular diaphragms) with different clamping distances, allowing each to be optimized for specific frequency ranges. This segmentation enables the first diaphragm to handle mid-range frequencies while the second diaphragm handles high frequencies, thereby extending the overall frequency range and reducing nonlinear distortion without requiring an overly complex single-diaphragm design
2Length of moving object
If diaphragm clamping distance is increased, then low-frequency response is improved, but high-frequency range is limited
Solution Approach 1:
The patent employs asymmetric clamping distances for the two diaphragm assemblies, where the first annular diaphragm has a first clamping distance and the second annular diaphragm has a second clamping distance that is different from the first. This asymmetric configuration allows each diaphragm to be independently optimized: one for low-frequency response with larger clamping distance and the other for high-frequency response with smaller clamping distance, thereby resolving the contradiction between low-frequency improvement and high-frequency limitation
3Weight of moving object
If diaphragm moving mass is increased, then low-frequency output is enhanced, but high-frequency range and sensitivity are reduced
Solution Approach 1:
Each diaphragm assembly is given different local properties through distinct clamping distances and resulting moving masses. The first annular diaphragm is designed with a first moving mass optimized for mid-range frequencies, while the second annular diaphragm is designed with a second moving mass optimized for high frequencies. This local differentiation allows each component to perform optimally in its designated frequency range, preventing the trade-off where increasing mass for low-frequency output sacrifices high-frequency performance
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 dual asymmetric compression driver achieves improved sound quality by optimizing each diaphragm for its frequency range, reducing nonlinear distortion, and extending the high-frequency range with lower acoustical compliance, resulting in higher overall sound pressure level (SPL) and sensitivity.
Implementation Method 1
The first driver assembly is positioned about a central axis and includes a first annular diaphragm having a first planar section extending at a first clamping distance. The second asymmetric driver assembly is positioned about the central axis and includes a second annular diaphragm having a second planar section extending at a second clamping distance.
Implementation Method 2
The first clamping distance is different from the second clamping distance causing the first asymmetric driver to provide a first audio output in a first frequency range and the second asymmetric driver to provide a second audio output in a second frequency range.
Implementation Method 3
U.S. Pat. No. 8,280,091 to Voishvillo discloses, among other things, a phasing plug that includes a base portion having an input side, an output side, a plurality of entrances on the input side, a plurality of exits on the output side arranged about a central axis, and a plurality of channels fluidly interconnecting the entrances with the respective exits. Each corresponding entrance, channel and exit establish an acoustical path from the input side to the output side that is non-radial relative to the central axis.
Data Source
AI summary
In at least one embodiment, a dual asymmetric compression driver is provided. The dual asymmetric compression driver includes a first driver assembly and a second driver assembly. The first driver assembly is positioned about a central axis and includes a first annular diaphragm having a first planar section extending at a first clamping distance. The second driver assembly is positioned about the central axis and includes a second annular diaphragm having a second planar section extending at a second clamping distance. The first clamping distance is different from the second clamping distance causing the first asymmetric driver to provide a first audio output in a first frequency range and the second driver assembly to provide a second audio output in a second frequency range.