![]() If you have a 10" The average SD/Cone area is about 50-60sq inches (to find SD in inches, you measure the cone, by useing a tape measure, and measure from middle of surround, to middle of surround on opposite side) 10" is usually close to 9"- 8.5"-9". Pretty long huh? And the worst part is, to have a true T-line, you need to keep the port/tunnel/line - a Line, that equals Cone area, or pretty close to it. To calculate length of Freq Devide 1130 / (freq) say 30hzġ130/ 30 = 37.66 ft long Full wave length But we need to devide this by 4- for 1/4 wave wich equals= 9.41ft long Quarter wave is all based on speed of sound, and length of the sound wave. So, heres the formula, its simple, you would just need a pen, paper, and calculator. Another Main plus side to tlines are, there is no back presure to keep efficiency up, xmax up, and allows the subwoofer to stop on a dime, and start back up faster than sealed, or ported designs. I still have never pwersonally ran over 500watts to a tline, yet I always stay in the low 140db-high 130s with awesome SQ. Its in the environment that subwoofer is built for, with absolutley NO amplifier strain, yet huge db outputs. No more of that, "What box sounds best for my sub?" If you do a tline based on your subs Fs, That IS the perfect box POSSIBLE for that sub. I stick with tlines, because personally, its the Perfect box, for your sub. Over the years I have learned tricks, and short cuts to tlines. Maybe good for a large van, but definitley not a car. Pretty damn big box Just 1 -15" tuned at 24hz will yeald about a 14+cf box. 40hz quarter wavelength is only 7.06ft long (round to about 7ft) When 24hz is 11.77ft long, and then multiply that 11.77ft by the SD of the cone. But a 12" with a 40hz bass boost can be as small as a sql box, for the same subwoofer. Most websights say how Tlines are un-realistic for cars, yeah, a 15" with a 24hz Fs, is pretty unrealistic. Anyone with simple 8th grade- no scratch that, 6th grade level math can calculate tline enclosure dimesnions. When honestly, 1/4 wave theory is easier than trying to calculate port dimension with no program. All I ever see is people sending links, and thats all I ever did to, was send links- to confusing brain boggler websights. Okay, some people will hate me for posting this, hopefully no one on the great world famous SMD forums :^ But I see alot of people asking about 1/4 wave T -line, Horn design/theory. UPDATED with new pics, different subs, sorry about the wait people ![]()
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December 2022
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