The Patents of… Paul W. Klipsch

The Patents of… Paul W. Klipsch


(Image source: https://www.klipsch.ca/pages/founder)

Paul W. Klipsch, a visionary in the field of audio engineering, made significant contributions through a series of innovative patents. These patents not only advanced the technology of their time but also laid the groundwork for future developments in loudspeaker design and acoustic engineering. Here’s an exploration of five of his most impactful patents, including one that demonstrates the versatility of his engineering prowess. You will see two levels of technical explanation: ELI5 (explain like I’m five) and ELI15 (explain like I’m fifteen).

1. Horn for Loud-Speaker (US Patent 2310243)

  • Filed: November 10, 1939
  • Granted: February 9, 1943
  • Description: This patent describes the original design for a folded exponential horn loudspeaker, a precursor to the famous Klipschorn.

The Horn for Loud-Speaker (US Patent 2310243) was groundbreaking because the folded horn design maximizes efficiency and minimizes distortion by directing sound waves in a controlled manner. This innovation remains a fundamental concept in high-fidelity loudspeaker design, as evidenced by the long-standing production of the Klipschorn, known for its ability to reproduce live concert sound quality in a home setting.

ELI5: Imagine a loudspeaker as a megaphone that makes sounds louder and clearer. Klipsch’s horn design folds the megaphone into a compact shape, so it fits in your room but still makes the sound big and powerful.

ELI15: The folded exponential horn in this patent optimizes the path that sound waves travel from the speaker driver to your ears. By folding the horn, Klipsch managed to create a compact yet highly efficient design that enhances sound projection and reduces distortion. This is achieved through precise control of the expansion rate of the horn, which allows sound waves to propagate smoothly and efficiently.

2. Loudspeaker Horn (US Patent 2537141)

  • Filed: May 31, 1946
  • Granted: January 9, 1951
  • Description: This patent describes a loudspeaker horn designed to increase the efficiency of sound reproduction by directing sound waves more effectively.

The Loudspeaker Horn (US Patent 2537141) was crucial in reducing distortion and enhancing sound clarity, allowing for louder and more accurate audio with less power. This principle of high efficiency and low distortion has influenced countless subsequent innovations in the industry, solidifying Klipsch’s reputation as a leader in acoustic engineering.

Key Differences:

  • Focus of Innovation:
    • First Patent (2310243): Focuses on the overall concept and implementation of a folded horn design to achieve high efficiency and low distortion.
    • Second Patent (2537141): Concentrates on refining the horn’s shape and construction to enhance sound clarity and reduce distortion even further.
  • Design Specificity:
    • First Patent (2310243): Introduces the foundational design of a folded exponential horn, which is significant for its compact efficiency.
    • Second Patent (2537141): Provides technical improvements and refinements to the horn structure, optimizing the initial design for better performance.
  • Technical Advancements:
    • First Patent (2310243): Lays the groundwork for future horn-loaded speaker designs with its innovative folding technique.
    • Second Patent (2537141): Builds upon this groundwork with specific enhancements to improve the practical application of the horn design in loudspeakers.

3. Crossover Filter Network (US Patent 2612558)

  • Filed: May 14, 1948
  • Granted: September 30, 1952
  • Description: This patent covers a crossover filter network designed to divide audio signals into different frequency bands, directing each band to the appropriate driver (e.g., woofers for low frequencies, tweeters for high frequencies).

The Crossover Filter Network (US Patent 2612558) was a groundbreaking innovation for multi-driver loudspeakers. It ensured that each driver received the correct frequency range, enhancing overall sound quality and system efficiency. By optimizing frequency distribution, Klipsch set a standard in audio engineering that remains influential in today’s loudspeaker designs.

ELI5: Imagine a music band where each member plays only the notes they are best at—bass for the bassist, high notes for the singer. Klipsch’s crossover network makes sure the right sounds go to the right parts of the speaker, so the music sounds great.

ELI15: The crossover filter network divides the incoming audio signal into different frequency ranges and directs each range to the appropriate speaker driver (e.g., low frequencies to the woofer, high frequencies to the tweeter). This separation ensures that each driver handles the frequencies it is designed for, reducing distortion and enhancing clarity. The precise filtering and distribution improve the overall performance of the speaker system, providing a more accurate and balanced sound.

4. Loudspeaker (US Patent 2731101)

  • Filed: November 10, 1953
  • Granted: January 17, 1956
  • Description: This patent covers a loudspeaker design focused on improving the overall efficiency and performance of sound reproduction. It involves innovations in the construction and arrangement of components within the loudspeaker to enhance sound quality.

The Loudspeaker (US Patent 2731101) set new standards for loudspeaker design, ensuring better sound clarity and efficiency. Klipsch’s improvements influenced the development of more effective and high-fidelity loudspeakers, benefiting both consumer and professional audio markets.

ELI5: Think of this patent like upgrading your TV from black-and-white to color. Klipsch made speakers that sound clearer and better, so when you listen to music, it feels like you’re there with the band.

ELI15: This patent involves optimizing the internal design and components of the loudspeaker to improve sound wave propagation and minimize distortion. By carefully arranging elements like the diaphragm and enclosure, Klipsch achieved a more efficient transfer of sound energy, resulting in higher fidelity audio reproduction. This innovation laid the groundwork for modern loudspeaker technology, ensuring that speakers could deliver clearer and more accurate sound across a range of frequencies.

5. Low Frequency Folded Exponential Horn Loudspeaker (CA1111775A)

  • Filed: June 2, 1977
  • Granted: January 2, 1982
  • Description: This patent outlines a small dimension low frequency loudspeaker with a folded exponential horn that provides a unitary curved sound path from the electroacoustic transducer to the mouth of the horn.

The Low Frequency Folded Exponential Horn Loudspeaker (CA1111775A) allowed for high-quality low-frequency sound reproduction in a compact form factor. This design maintained the benefits of a folded horn, such as high efficiency and low distortion, while being suitable for smaller spaces. It made high-fidelity audio more accessible and practical for various environments, including home audio systems and smaller venues.

ELI5: Think of this like a small but mighty subwoofer. Klipsch’s design makes sure even the small speakers can produce deep, powerful bass sounds, perfect for your living room.

ELI15: This design incorporates a folded exponential horn that allows low-frequency sounds to be reproduced efficiently in a compact speaker. By carefully folding the horn within a small enclosure, Klipsch managed to preserve the benefits of horn-loading—high efficiency and low distortion—while reducing the speaker’s physical size. This innovation made it possible to have powerful bass output in smaller spaces, enhancing the versatility and appeal of high-fidelity audio systems.

6. Firearm Vibration Control (US Patent 2302699)

  • Filed: November 14, 1942
  • Granted: November 14, 1942
  • Description: This patent covers a method for controlling vibrations in firearms to improve shooting accuracy. By attaching a pendulum mass to the barrel, the vibrations are controlled, resulting in a more stable barrel and thus improved accuracy.

That’s right! He didn’t just revolutionize audio technology—Paul W. Klipsch also ventured into the world of firearms with his Firearm Vibration Control (US Patent 2302699). This ingenious patent, though primarily for firearms, shares significant principles with audio technology. By controlling and reducing unwanted vibrations, Klipsch’s method improves the stability and accuracy of firearms. These same principles can be directly applied to loudspeaker design. By minimizing cabinet vibrations, similar to how firearm vibrations are controlled, audio performance is enhanced. This crossover of engineering principles highlights Klipsch’s versatile expertise and his ability to innovate across different fields, ultimately benefiting the audio industry.

ELI5: Imagine holding a wobbly pencil while trying to draw a straight line. Klipsch’s invention stops the wobbling in guns so they shoot straighter, and this idea helps speakers sound better by stopping unwanted vibrations.

ELI15: This patent involves attaching a pendulum mass to the barrel of a firearm to control its vibrations. When a gun is fired, the barrel vibrates, which can affect accuracy. The pendulum mass acts as a counterbalance, reducing these vibrations and stabilizing the barrel. In loudspeakers, similar principles can be applied to reduce cabinet vibrations, leading to clearer and more precise sound reproduction. By controlling mechanical vibrations, both firearms and speakers can perform more reliably and accurately, showcasing Klipsch’s innovative application of engineering concepts across different fields.

7. Recording Seismic Waves (US Patent 2232612)

  • Filed: February 18, 1941
  • Granted: February 18, 1941
  • Description: This patent details a method and apparatus for recording seismic waves, primarily for use in geological exploration. The system improves the accuracy and reliability of seismic wave recordings, which are critical for understanding subsurface structures.

What can’t the man do!? The Recording Seismic Waves (US Patent 2232612) was crucial for advancements in geological exploration and seismic research. By enhancing the precision of seismic recordings, Klipsch’s invention contributed to more accurate mapping of underground resources, benefiting the oil and gas industry as well as scientific research.

ELI5: Think of this like upgrading from a blurry camera to a high-definition one. Klipsch made it easier to take clear “pictures” of underground rocks and resources, helping geologists find oil and gas.

ELI15: This patent involves a system for capturing and recording seismic waves with improved accuracy. By refining the equipment used to detect and measure these waves, Klipsch ensured that geologists could obtain more precise data about the Earth’s subsurface structures. This technology is vital for identifying the location and composition of underground resources, leading to more efficient and effective exploration efforts in industries such as oil and gas extraction.

Paul W. Klipsch’s patents showcase his knack for tackling tough engineering challenges, not just in audio tech but beyond. From creating groundbreaking loudspeaker designs and crossover networks to inventing vibration control for firearms, Klipsch had a profound grasp of acoustics and mechanical engineering. His inventive spirit has left an indelible mark on the industry, ensuring that high-fidelity audio remains both top-notch and accessible. Klipsch’s legacy continues to resonate in modern audio engineering, cementing his status as a true pioneer and innovator.

(Image source: https://www.klipsch.ca/pages/founder)

2024 PMA Magazine. All rights reserved.


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