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. 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. 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

Speaker enclosure design theory