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Quarter Wavelength Loudspeaker Design
Derivation and Correlation of a General Acoustic Model for a Fiber Filled Transmission Line Loudspeaker.
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  • Online Since: Jul 17, 2002

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  1. Title
    Quarter Wavelength Loudspeaker Design
  2. < meta > Description
    Derivation and Correlation of a General Acoustic Model for a Fiber Filled Transmission Line Loudspeaker.
  3. < meta > Keywords
    Martin J. King, transmission lines, transmission line, transmission line speakers, transmission line loudspeakers, speaker design, speaker projects, Focal, Fostex, Lowther, TQWT, ML TQWT, TL, Transmission Lines, Transmission Line, Transmission Line Speakers, Transmission Line Loudspeakers, OB, Open Baffle, Open Baffle Speakers, Open Baffle Loudspeakers
  4. Keywords hit in search results
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  5. Search Engine Recommended Keywords
    Quarter Wavelength, Quarter Wave Antennas, Quarter Wave Plates, Quarter Wave Theory, Quarter Wave Calculator, Quarter Wave Antenna Formula, Quarter Wave Monopole Antenna, Quarter Wave Vertical Antenna,
  6. Captured Content
    Quarter Wavelength Loudspeaker Design. King, 7/17/02 (last revised 5/18/11). Click to join quarter-wave. Welcome to my quarter wavelength loudspeaker design website. The most common example of a loudspeaker that relies on a quarter wavelength acoustic standing wave is a transmission line enclosure. This style of loudspeaker has been on the fringe of the audio mainstream for many years with just a few smaller companies building and marketing this enclosure design. Even more exotic and rare in the audio marketplace are the TQWT and the horn loaded enclosure designs. All of these enclosures utilize acoustic standing waves that can be described as multiples of a quarter cycle of a sine or cosine function. Hence my terminology of a "Quarter Wavelength Loudspeaker Design" to describe the content of the articles contained in this website. I have been interested in transmission line loudspeakers for almost 20 years. However, for a long time the lack of a proven mathematical model prevented me from actually pursuing and building this style of loudspeaker enclosure. Over the past 15 years, I have built a number of closed and ported box loudspeakers based on the equivalent circuit models descibed by Thiele and Small. About 10 years ago, I decided to try and develop my own mathematical model to simulate transmission line loudspeakers using the MathCad computer program. This decision set off the chain of events that eventually resulted in this website. My first two quarter wavelength style enclosures were designed mathematically, built, and then final acoustic and impedance measurements were performed. The results of these two efforts are documented and can be found in the projects section of this website. During the process of completing these two loudspeakers, the MathCad models went through a continuous evolution which produced more accurate calculated results leading to better correlations between the predictions and the measurements. Recently, I started building a third type of quarter wavelength enclosure that is difficult for me to classify. From the outside it would appear to be a bass reflex enclosure. But acoustically, quarter wavelength standing waves inside the enclosure are used to produce the bass response emanating from the port. Is this project a mass loaded transmission line design or a bass reflex design? I am not so sure, the differences are starting to get very fuzzy. Some information on this type of speaker is also included in the projects section of this website. The newest versions of the MathCad worksheets are based on a calculation algorithm that is proving to be extremely flexible. This flexibility has allowed me to extend the original transmission line models to simulate a wide variety of enclosure styles. In the process, it became clear that the direction my work was headed made it difficult to continue to classify it as strictly transmission line theory and design. I felt that the best way to present and maintain this ongoing study of quarter wavelength enclosure design was to construct my own website. Front and Back Loaded Horn Theory. General Speaker Related Articles. Quarter Wavelength Loudspeaker Design Gallery. Upgra ...
  7. Captured Keywords
    projects, links, king

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    Quarter Wavelength Loudspeaker Design
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Quarter Wavelength Loudspeaker Design
by Martin J. King, 7/17/02 (last revised 6/21/12) Click to join quarter-wave. Welcome to my quarter wavelength loudspeaker design website. The most common example of ...
TWT Amplifiers, Traveling Wave Tube Amplifiers, Microwave ...
High Power Traveling Wave Tube Amplifiers (TWTA), High Voltage Power Systems and Test Equipment for Microwave Tubes. Quarterwave manufactures a complete line of ...
Quarter Wavelength Loudspeaker Design Gallery
A Folded Tapered Quarter Wave Pipe using the Fostex FE-167E Full Range Driver Rear View Built by Richard Goodland. Visaton FRS8 Full Range Drivers in Bipole Enclosures ...
Quarterwave Corp., manufacturer of TWT Amplifiers
Manufacturer of High Power TWT Amplifiers since 1987. ABOUT QUARTERWAVE. Quarterwave Corporation's current Traveling Wave Tube (TWT) Amplifiers have evolved from the ...
Wave plate - Wikipedia, the free encyclopedia
For instance a quarter-wave plate creates a quarter-wavelength phase shift and can change linearly polarized light to circular and vice versa. This is done by adjusting the ...
Dipole antenna - Wikipedia, the free encyclopedia
A dipole antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented ...
Quarter wave vertical antenna :: Radio-Electronics.Com
Overview or summary about the basics of the quarter wave vertical and ground plane antennas that ares widely used for medium wave broadcasting, mobile radio ...
Quarter-wave Tricks - Microwave Encyclopedia -
Quarter-wave tricks. Updated December 31, 2011. Click here to go to our page on basic concepts of microwaves
Quarter-wave plate - Georgia State University
Quarter-Wave Plate. A quarter-wave plate consists of a carefully adjusted thickness of a birefringent material such that the light associated with the larger index of ...
A quarter wave line can also be used in place of a resonant LC circuit. The input impedance of an open circuited quarter wave line is zero (short circuit).
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