Posted on Wednesday, November 04, 2009 - 15:03 GMTMe and my buddy researched t-line box builds after we went to a local car audio shop and had the owner explain tried to explain them to us. It is actually considered a quarter wavelength box and the port is roughly 7 feet long. The port area had to equal the cone surface We put a power acoustik mofo in the tline box and it was louder than 3 mofo's in a ported box 7 cubes tuned to 34 hertz. I know we need better equipment, but hey we're poor kids lol. Its 3/4 mdf, 45'd all the corners in the port.

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Posted on Sunday, November 08, 2009 - 21:11 GMTWould anyone mind helping me figure out proper port area+ length for my IDMAX. I think it could be amazing in a t-line. If you wanna be really nice a drawing would be sweet. Cone area of the IDMAX is 545cm^2 which i think is about 84.48in^2 That seems like a pretty large port to me. Is that right? If I'm doing it correctly I would need like 15Hx5.6W and say I wanted to tune to 34hz like you did I would need 8.25 ft of port depth? As far as the corners of the port, Do I need to take into account putting in 45degree angles and make the port longer?

Anyone have more info on building T-lines? Posted on Saturday, November 14, 2009 - 17:58 GMTIDK if your wrong in your design but I have found this diagram and it is different from your design. } This is a tappered version for lower fresquency subs but it is still the same concept. An well your design seems like the placement of your sub will reflect the sound wave back to the speaker. Is there anyone with more knowledge of this box design.

That link you have all the pictures are corrupt so that is no help. I'm am trying to desgin one of these boxes. Posted on Wednesday, November 18, 2009 - 06:50 GMTIsobaric is so u can 1/2 the vas! Allows u to put say a 15' speaker in a box 1/2 the size.

But- its less efficient. Just allows u to use a larger speaker in a smaller box.

BUT- then ur throwing away money on the 2nd driver- cuz the cone area isnt utilized? SO why not just spend ur money on the proper drivers for the size of box u can build for the space u want to use up?

If u go ported say, then each time u Double the cone area, u gain 3 db (unless each speaker receives the same power )ie: 2x 10's, then 4x 10's, then 8x 10's then 16x 10's. THE more drivers and cone area- the MORE output given the same power. Telugu mp3 songs free download.

IF u dump 3000 watts to an 8' sub- it can only mover so far and only move so much air. Better to go MORE cone squares.

Quarter Wavelength Loudspeaker Design Quarter Wavelength Loudspeaker Design by Martin J. King, 7/17/2002 (last revised 1/27/2019) 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 25 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 15 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. 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.