Sealed Loudspeaker Design Using Professional Drivers
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Solution Overview
Problem
Sealed loudspeaker designs using professional sound reinforcement drivers face challenges in achieving low frequency efficiency and compact enclosure size suitable for audiophile and home environments, as they typically require large enclosures or ported designs.
Innovation Solution
A sealed loudspeaker design incorporating professional sound reinforcement drivers with specific Thiele/Small parameters, such as a compliance volume range of 140 to 1800 liters and a system compliance ratio less than 7.0, along with a crossover network and enclosure volume of less than 300 liters, to achieve efficient low frequency reproduction and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If professional sound reinforcement drivers are used in sealed loudspeaker designs, then low frequency efficiency is improved, but enclosure volume increases
Solution Approach 1:
The patent applies parameter changes by selecting professional sound reinforcement drivers with specific Thiele/Small parameters (compliance volume Vas between 140-1800 liters, system compliance ratio α less than 7.0, reference efficiency greater than 1.5%, and total system quality Q between 0.5-1.0) that differ from conventional Hi-Fi drivers. These parameter changes enable the drivers to achieve low frequency efficiency in sealed enclosures while maintaining a compact size of less than 300 liters, resolving the contradiction between efficiency and enclosure volume.
2Measurement precision
If sealed enclosure design is used, then transient response accuracy is improved, but low frequency efficiency decreases
Solution Approach 1:
The patent resolves this contradiction by changing the driver parameters to professional sound reinforcement specifications with reference efficiency greater than 1.5% and total system quality Q between 0.5-1.0. These parameter changes compensate for the inherent low frequency efficiency reduction in sealed enclosures, allowing the system to maintain both accurate transient response and adequate low frequency efficiency without requiring ported designs.
3Power
If professional sound reinforcement drivers are used, then power handling capability is improved, but driver size increases
Solution Approach 1:
The patent applies parameter changes by selecting professional sound reinforcement drivers with reference efficiency greater than 1.5% and compliance volume Vas between 140-1800 liters. These parameter changes enable the drivers to achieve high power handling capability while maintaining a driver size and enclosure volume of less than 300 liters, making them suitable for home and audiophile environments rather than only large-scale applications.
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 design achieves a low frequency cut-off of 70 Hz or below in a sealed enclosure with improved transient response and efficiency, suitable for the home and audiophile markets, while maintaining a compact and visually appealing form factor.
Implementation Method 1
A loudspeaker is an electroacoustic transducer which converts an electrical audio signal into a corresponding sound
Implementation Method 2
The enclosure housing provides a resonance space. One of the fundamental requirements for designing a loudspeaker is to achieve a low resonant frequency in a speaker enclosure
Data Source
AI summary
The invention relates in general to the field of high fidelity audio reproduction and to the design process and selection of a sealed loudspeaker for the home and audiophile markets. The sealed loudspeaker has at least one professional sound reinforcement driver, a crossover network, a sealed enclosure, and the enclosure volume is less than 300 liters. The at least one professional sound reinforcement driver has a small compliance volume (Vas) or a large system compliance ratio (α) for a total system quality of between 0.5 and 1.0.