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David gunness of fulcrum acoustic

Circuit Break Podcast #203

Lizard Brain Information – David Gunness of Fulcrum Acoustic

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December 18, 2019, Episode #203

David Gunness of Fulcrum Acoustic joins the podcast to discuss Passive Cardioid Technology, Coaxial Speakers, and manufacturing with wood.

David Gunness

  • Vice President of R&D at Fulcrum Acoustic
  • Lead Product Designer
  • Photographer
  • Copy Writer
  • Ambassador to Italy
  • Facilities Maintenance
  • Director of Calculus
  • Technical Writer
  • Lead Coffee Maker

Fulcrum Acoustic

  • Who are they and what do they do?
  • What does it take to get into sound design?
    • Education?
    • Frequency Theory
  • Passive Cardioid Technology
    • Technology to eliminate rear low frequency radiation
      • Where is this an issue?
    • Active solution
    • Passive solution
    • Patent 10,123,111 B2 “Loudspeaker with passive low frequency directional control”
  • Building a better coaxial speaker
    • What is a coax?
    • Beamwidth
    • How is this validated/tested?
  • Manufacturing enclosures with wood
    • Why wood?
    • Sourcing materials
    • General Design
    • Tolerancing considerations?
    • Finishing and Covering
      • Sanding
      • Painting
      • Spraying materials
David Gunness of Fulcrum Acoustic.

David Gunness of Fulcrum Acoustic.

About the Hosts

Parker dillmann
  Parker Dillmann

Parker is an Electrical Engineer with backgrounds in Embedded System Design and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. The following year he designed and produced an Atari 2600 video mod to allow the Atari to display a crisp, RF fuzz free picture on newer TVs. Over a thousand Atari video mods where produced by Parker from 2006 to 2011 and the mod is still made by other enthusiasts in the Atari community.

In 2006, Parker enrolled at The University of Texas at Austin as a Petroleum Engineer. After realizing electronics was his passion he switched majors in 2007 to Electrical and Computer Engineering. Following his previous background in making the Atari 2600 video mod, Parker decided to take more board layout classes and circuit design classes. Other areas of study include robotics, microcontroller theory and design, FPGA development with VHDL and Verilog, and image and signal processing with DSPs. In 2010, Parker won a Ti sponsored Launchpad programming and design contest that was held by the IEEE CS chapter at the University. Parker graduated with a BS in Electrical and Computer Engineering in the Spring of 2012.

In the Summer of 2012, Parker was hired on as an Electrical Engineer at Dynamic Perception to design and prototype new electronic products. Here, Parker learned about full product development cycles and honed his board layout skills. Seeing the difficulties in managing operations and FCC/CE compliance testing, Parker thought there had to be a better way for small electronic companies to get their product out in customer's hands.

Parker also runs the blog,, where he posts his personal projects, technical guides, and appnotes about board layout design and components.

Stephen Kraig
  Stephen Kraig

Stephen Kraig began his electronics career by building musical oriented circuits in 2003. Stephen is an avid guitar player and, in his down time, manufactures audio electronics including guitar amplifiers, pedals, and pro audio gear. Stephen graduated with a BS in Electrical Engineering from Texas A&M University.

Special thanks to whixr over at Tymkrs for the intro and outro!