FIR Cable Loop Speaker System for Balanced Power Delivery
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Solution Overview
Problem
Industry standard one-way dead-end cabling systems for audio speakers result in degraded performance and inconsistent acoustic experience across multiple speakers due to unbalanced power delivery and signal degradation, which conventional DSP equalization cannot adequately correct.
Innovation Solution
A cable loop system with a feeder and return configuration that connects speakers in series, parallel, or series/parallel configurations, providing balanced power and optimizing frequency response and dynamic range by reducing resistance and inductance, and allowing for mixed wire gauges and conductor types to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If one-way dead-end cabling is used to connect speakers to amplifiers, then the first speaker receives the highest fidelity signal, but subsequent speakers experience degraded performance and inconsistent acoustic quality
Solution Approach 1:
The patent inverts the conventional dead-end cabling approach by implementing a loop configuration where the cable returns to the amplifier after connecting all speakers. This reversal allows the signal to traverse the entire speaker chain and return, balancing the electrical characteristics and delivering consistent performance to all speakers rather than degrading with each subsequent connection.
Solution Approach 2:
The patent changes the electrical parameters of the cabling system by introducing a return path that equalizes the inductance and capacitance distribution throughout the system. This parameter change transforms the unbalanced dead-end configuration into a balanced loop configuration, improving signal fidelity and acoustic consistency across all speakers simultaneously.
2Measurement precision
If DSP equalization is used to correct performance differences between speakers, then some frequency response improvement is achieved, but the system complexity increases and cannot properly correct all speakers
Solution Approach 1:
The patent extracts the equalization function from the digital signal processing domain and implements it at the electrical level through the loop cabling configuration. By taking out the need for complex DSP processing and replacing it with a simple electrical loop structure, the system achieves frequency response correction without increasing device complexity.
3Reliability
If cable length is kept short to minimize capacitance and inductance effects, then signal integrity is improved for individual speakers, but long cable runs are required for multiple speakers
Solution Approach 1:
The patent resolves the cable length contradiction by inverting the conventional approach: instead of keeping cables short to minimize electrical effects, the loop configuration embraces long cable runs by returning the signal through the same cables. This inversion allows the cables to serve dual purposes (forward and return paths) and balances the electrical characteristics, making long cable runs suitable for multiple speakers while maintaining signal integrity.
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 FIR cable loop system achieves significant improvements in signal distribution, power delivery, and acoustic consistency across all speakers, reducing installation complexity and errors while eliminating the need for costly transformers and exotic materials, and allowing for plug-and-play functionality.
Implementation Method 1
In line inductance is reduced by 50% due to connections of the feeder and return cables, resulting in significant frequency response and dynamic range improvement
Implementation Method 2
In the FIR loop system, there is lower resistance due to a higher current carrying capacity, resulting in a lower voltage drop and more power delivered to each speaker
Data Source
AI summary
A feeder/interconnection/return (FIR) Cable Loop System vastly improves the distribution, equalization, efficiency and power delivery of high performance multiple speaker systems, without the complexities and inherent inefficiencies of existing systems. This is achieved by a feeder cable which connects from an amplifier to the first speaker, while interconnecting cables connect all the speakers to each other. A return cable connects the last speaker back to the amplifier. This results in balanced power, significant improvement in frequency response, and dynamic range.