Clicky
The thread is like 25 pages long and the pics on the first page doesnt work but most of the theory is in the first post.
Just wanted to get a discussion about these started here. Anyone ever built one?
I like the idea. Im not going to say i fully understand it. Though it seems ideal except for the large size and our small cars but in something like a Blazer it might be more useful. Im curious as how it would work in a daily system.
looks extremely interesting.... i may try it on a 8" sub or somthing. i wish the pics worked so i knew what he was talking about.
according to what ive read there. if your not metering it and you fudge the dims a little to get it to fit it will be great for a daily driver. it says you can go from 20-40 hz thats pretty good in my opinion. and its full output throughout the range. i really like this.
thanks for posting
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It also doesnt sound like a very forgiving box if designed poorly. Possible sub destruction.
so its basically just a sub with a port? no actual "box" but just the port. so like he said start using pvc and get some calculations down then move on to wood..
interesting.
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easy!
excuse my little crappy diagram... but why 1/4 wavelength is so important in this design, is it's because it's the highest amplitude of the POSITIVE going signal (3/4 would be negative going... but still a factor here). now, I'm going to assume that what he's talking about is the same characteristic that's used in radar "T-lines", aka waveguide. so, I can see what he's doing in my head and I'll try to explain.
looking at the drawing above that EcoCav posted up, you'll see the open port at the end of the T-line. basically, we know that sound travels in waves, right? well, it just so happens that when the half-wavelength of a given frequency hits that open port FIRST (important part!), some of the energy from that wave will be reflected back (also known as VSWR, or Voltage Standing Wave Ratio) to the source. you'll get signal cancellation, sound degradation, all sorts of nasty stuff. once all that crap starts happening, it just... well... doesn't stop, until the length of the T-line is corrected. by building the box correctly, and making sure one of the quarters (1/4 or 3/4) hits the open port first (voltage is at max, whether at positive or negative), we don't have any wave reflection.
now, when I say "hits the open port first", I do mean when the sub first starts. because the length of the T-line is determined by one frequency, and sound travels in waves, by getting the length right the first time, the quarter wavelengths will always get to the port first, given that the sub is always outputting the same frequency.
once the speaker starts outputting different frequencies, it's a whole other ballgame.
Desert Tuners
“When you come across a big kettle of crazy, it’s best not to stir it.”
so are his calculations correct? im going to try this with one of my power acoustik fubars somtime i think. just want to know.
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transmission lines hit a specific frequency, and when they hit it, it's like butter. In the picture there, imagine that's a range from 30 to about 35 hertz. Sounds great for that one frequency, but drops in performance with any other frequency considerably.
But he also says they make good SQ boxes. Now that seems contradictory to me because obviously only hitting one frequency would sound like ass of music.
from what i got from reading that is that you will hit extremely hard. to the subwoofers full potential at that certain fs parameter. but it does slope down off that. however it still hits pretty hard at a range of frequencies.
but i could be reading between the lines too much.
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a design for a t-line
my 12" fubar design for a t-line box. its fs is 36 hz which is good i think. not sure about other parameters on it though as it is discontinued
c & c welcome. just kinda throwing it out there.
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