Directive Multiway Loudspeaker Waveguide Resonator Design
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Solution Overview
Problem
Loudspeakers with multiple drivers face issues with sound diffractions and resonance problems due to discontinuities on the front baffle surface, particularly affecting the high frequency driver, and covering low frequency drivers can lead to dynamic performance issues and unwanted resonances.
Innovation Solution
Acoustically connecting resistive or reactive resonators to the sub-volume of the woofer within the loudspeaker enclosure, allowing the entire front surface to be formed as a continuous waveguide for mid- and high frequencies without disturbing resonances, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the low frequency driver is covered to maintain continuous waveguide surface, then sound diffraction is reduced, but dynamic performance deteriorates and unwanted resonances are created
Solution Approach 1:
A resonator is introduced as an intermediary acoustic element between the covered low frequency driver and the external environment. The resonator has a tuning frequency that matches the unwanted resonance of the sub-volume, allowing it to absorb and dissipate the harmful resonant energy while permitting the driver to operate with a covered surface, thus reducing diffraction without sacrificing dynamic performance
2Object-affected harmful factors
If resonators are added to suppress unwanted resonances, then sound quality is improved, but device complexity increases
Solution Approach 1:
The resonator is nested within the existing loudspeaker enclosure structure, utilizing the available internal space efficiently. The resonator is positioned within the sub-volume formed by the covered low frequency driver, integrating the resonance suppression function into the existing design without requiring additional external components or significantly increasing overall device complexity
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 solution enables precise audio range distribution from 18-20000 Hz to a 'sweet spot' with optimal sound pressure distribution in all directions, minimizing unwanted reflections and improving dynamic performance by suppressing resonances, and allowing for varied resonator designs and materials.
Implementation Method 1
the resonator being tuned to at least one of unwanted resonances of the sub volume
Data Source
AI summary
The present disclosure provides a loudspeaker including a uniform enclosure having front portion, side portions and back portion defining an inner volume, the front portion is formed as a waveguide surface and includes at least one driver in the waveguide surface and is capable of radiating the main acoustic power of the loudspeaker to direction of first acoustic axis, and an at least one additional driver attached to the enclosure, the additional driver is attached inside the enclosure such that a sub volume is formed inside the inner volume, the sub volume limited by the driver, spacers between the driver and the front portion, and the front portion of the enclosure, at least one first port is adapted to open from the sub volume to ambient volume either to side portion or back portion of the enclosure, and at least one resonator including at least one resonator cavity acoustically connected to the sub volume, the resonator being tuned to at least one of unwanted resonances of the sub volume. The resonator may be formed as a separate unit connected to the uniform enclosure.