I welcome any and all comments, suggestions, or questions.
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My intention is for this website to become a dynamic entity that will grow and change as I continue to learn and extend the mathematical modeling methods described in the preceding sections. If you are interested in quarter wavelength designs, I hope that you will consider joining one of these Facebook Groups. I will not notify the group of every minor change, addition, or revision but I will send out an occasional notification if something significant is being added. I have also decided to start two Facebook Groups for the discussion of the Theory, Design, and Building of Transmission Lines Speakers and Open Baffle Speaker Systems that will be used to notify interested individuals of major revisions to the web site and allow discussion of the sites content and the latest MathCad worksheets. Quarter Wavelength Loudspeaker Design Gallery.I felt that the best way to present and maintain this ongoing study of quarter wavelength enclosure design was to construct my own website. 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. This flexibility has allowed me to extend the original transmission line models to simulate a wide variety of enclosure styles. The newest versions of the MathCad worksheets are based on a calculation algorithm that is proving to be extremely flexible. Some information on this type of speaker is also included in the projects section of this website. 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. But acoustically, quarter wavelength standing waves inside the enclosure are used to produce the bass response emanating from the port. From the outside it would appear to be a bass reflex enclosure. Recently, I started building a third type of quarter wavelength enclosure that is difficult for me to classify. 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. My first two quarter wavelength style enclosures were designed mathematically, built, and then final acoustic and impedance measurements were performed. This decision set off the chain of events that eventually resulted in this website. About 15 years ago, I decided to try and develop my own mathematical model to simulate transmission line loudspeakers using the MathCad computer program. 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. However, for a long time the lack of a proven mathematical model prevented me from actually pursuing and building this style of loudspeaker enclosure.
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I have been interested in transmission line loudspeakers for almost 25 years. Hence my terminology of a "Quarter Wavelength Loudspeaker Design" to describe the content of the articles contained in this website. All of these enclosures utilize acoustic standing waves that can be described as multiples of a quarter cycle of a sine or cosine function. Even more exotic and rare in the audio marketplace are the TQWT and the horn loaded enclosure designs. 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. The most common example of a loudspeaker that relies on a quarter wavelength acoustic standing wave is a transmission line enclosure. Welcome to my quarter wavelength loudspeaker design website. r/audiophile Quality audio reproduction of all forms.Quarter Wavelength Loudspeaker Design Quarter Wavelength Loudspeaker Designįacebook Group : DIY Transmission Line Loudspeakers - Theory, Design, and Buildingįacebook Group : DIY Open Baffle Loudspeakers - Theory, Design, and Building See the list of past AMAs here! Related subreddits Interesting Links Our Wiki Great Resources Why your first speaker should be a proven design
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A place to discuss DIY audio, share plans and schematics, and link to interesting projects.