Arcuate Biplane Speaker Array for Controlled Vertical Dispersion
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Solution Overview
Problem
Conventional loudspeaker systems face challenges in controlling directivity, especially at high frequencies, leading to inconsistent sound dispersion and significant SPL irregularities, which are impractical and costly to address in venues with varied audience heights.
Innovation Solution
A commercial music/public address speaker design featuring dual line arrays of tweeters and woofers in a biplane arrangement, with the tweeter array mounted in front of the woofer array in a staggered configuration, allowing for adjustable vertical dispersion and easy mounting on walls, using a single speaker cabinet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transducers or compression drivers are used in line array systems, then the system can be constructed, but high frequency performance deteriorates with inconsistent sound dispersion and significant SPL irregularities
Solution Approach 1:
The tweeter array is divided into multiple discrete transducers (at least three tweeters) arranged in a line, with each transducer contributing to the overall cylindrical wavefront. This segmentation allows for better high frequency performance while maintaining consistent sound dispersion through proper spacing and phasing of individual elements.
Solution Approach 2:
Multiple tweeters are combined in a coherent array configuration where their acoustic outputs are phased to work together as a unified source. This merging of multiple transducers creates a more consistent sound dispersion pattern and reduces SPL irregularities compared to using a single conventional transducer.
2Device complexity
If a straight line array configuration is used, then the structure is simple, but vertical dispersion control is insufficient for venues with varied audience heights
Solution Approach 1:
The tweeter array is configured with a curved or angled geometry rather than a straight line, allowing the vertical dispersion characteristics to be dynamically adjusted for different venue configurations. This dynamic geometric arrangement enables the system to adapt to venues with varied audience heights while maintaining structural feasibility.
Solution Approach 2:
Different sections of the tweeter array are positioned at different angles or heights to create localized dispersion control. The curved configuration ensures that sound energy is distributed vertically according to the specific audience area requirements, providing tailored coverage for different seating zones within the venue.
3Reliability
If the tweeter array is mounted far from the woofer array, then high frequency performance improves, but the overall system size and mounting complexity increase
Solution Approach 1:
The tweeter array is positioned at an optimized distance from the woofer array that provides sufficient separation for high frequency performance without requiring excessive spacing. This partial separation achieves the necessary acoustic independence while keeping the overall system compact and mounting complexity manageable.
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 design provides flexible and cost-effective controlled vertical dispersion, enhancing sound intelligibility and coverage in various environments without the need for complex mounting hardware, while maintaining acoustic performance and reducing energy loss.
Implementation Method 1
An ideal line source is an infinite, thin (narrow) and continuous vibrating element, which radiates cylindrical waves. Such a line source has an important radiation property, which is that its SPL level decreases inversely proportionately to the distance from the source, losing only 3 dB with each doubling of the distance.
Implementation Method 2
Controlling directivity of loudspeakers has always been one of the most important problems in commercial sound reproduction. Being able to aim and deliver sound energy precisely to one area and prevent the sound energy from falling onto another is one of the challenges of sound system designers.
Data Source
AI summary
A biplane line array speaker includes a line array of tweeters mounted substantially directly in front of a line array of woofers. The tweeter line array is arcuately shaped to provide controlled vertical dispersion above and below the boundaries of the speaker cabinet. The woofers are displaced from the tweeters in stepped manner. The speaker cabinet is a rectangular box, allowing efficient wall mounting in single or multiple unit columns. In multiple unit columns, the individual units acoustically couple to each other.