Variable Impedance Speaker Winding for Multi-Woofer Matching
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Solution Overview
Problem
Conventional loudspeakers typically have only 1-2 selectable impedances, which is inadequate for systems with three or more woofers, leading to inefficiency and potential damage to amplifiers due to mismatched impedance, and complex wiring configurations are cumbersome and prone to errors.
Innovation Solution
A variable impedance speaker apparatus with multiple voice coil wires wound simultaneously around a bobbin, allowing for three to four selectable impedances via a jumper system, and a jumper assembly that connects to different impedance settings, ensuring efficient and easy impedance selection while maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multiple voice coil wires are wrapped around a voice coil using the traditional approach of wrapping on top of another, then the voice coil provides selectable impedances, but the voice coil becomes heavy, cumbersome, and very inefficient
Solution Approach 1:
The patent transitions from wrapping voice coil wires in a single dimension (stacking layers on top of each other) to arranging them in multiple dimensions (side-by-side parallel winding around the bobbin). This dimensional change allows three voice coil wires to be arranged simultaneously without stacking, reducing the number of layers from six to three, thereby reducing weight and improving efficiency while maintaining impedance selection capability.
2Adaptability or versatility
If conventional speakers have only 1-2 different impedances, then the wiring configuration is simple, but it fails to achieve the best impedance for the amplifier when there are three or more woofers
Solution Approach 1:
The patent segments the voice coil system into multiple independent voice coil wires (at least three) that can be independently connected to different terminals. Each voice coil wire can be individually switched into the circuit through jumper connections, allowing flexible impedance combinations (e.g., series, parallel, or series-parallel configurations) to achieve multiple impedance values (4 ohms, 8 ohms, 16 ohms, and higher) without complex external wiring.
Solution Approach 2:
The patent introduces a dynamic impedance selection mechanism using jumper wires that can be moved between different terminal configurations. This allows the impedance of the loudspeaker to be dynamically adjusted by the user or system based on the amplifier requirements, transforming from a static single-impedance design to a dynamic multi-impedance system.
3Adaptability or versatility
If conventional approaches install loudspeakers in different parallel, series, and/or series parallel configurations, then various impedances can be achieved, but the wiring becomes complex with significant risk for mistakes or other complications
Solution Approach 1:
The patent introduces jumper wires as intermediary components that simplify the impedance selection process. Instead of requiring complex external wiring connections, the jumpers act as mediators that internally connect the voice coil wires to appropriate terminals in pre-configured arrangements. This intermediary mechanism encapsulates the complexity of series, parallel, and series-parallel configurations within the speaker assembly, making impedance selection simple and error-free for the user.
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 solution provides a lighter, more efficient voice coil with improved sound quality and tolerance across various impedance settings, addressing the limitations of conventional speakers by enabling easy impedance adjustment and reducing the risk of amplifier damage.
Implementation Method 1
An audio speaker, or loudspeaker, is an apparatus that converts electrical audio signals into sound which can be heard at a distance
Data Source
AI summary
A variable impedance speaker apparatus comprising multiple, selectable impedances and multiple voice coil wires. In some embodiments, the speaker provides three to four different impedances which can be easily selected by inserting a jumper into the desired coil arrangement to configure the voice coil accordingly. In further embodiments, the speaker apparatus comprises multiple voice coil wires wherein each voice coil wire is wound about a voice coil at the same time.