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Old 04-12-2013, 02:25 AM
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Default reading about t-line enclosures

my box for my sa8s is 1.0 cu/ft with 56 in of port. is this almost a t-line style design? looking at other boxes online that have a lot less port length for the same tuning and getting very confused why mine plays pretty flat from ~70-40 then goes crazy from ~40-28. or did i just build a shitty low peak box lol

please help. all this reading has hurt my brain and only raised more questions.
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Old 04-12-2013, 04:26 AM
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The problem with t-lines is there's several "versions" of what they are, some of which are in conflict with each other. In a very strict sense, a TL design is one that aligns impedance throughout the spectrum with no tuned resonance at all. More commonly, the 1/4 (or 1/2, or even full) wave TLs are mass loaded tuned enclosures just like a regular ported box, except with much lower group delay and a smoother drop-off on the low end similar to IB. Of course, the term "transmission" implies directivity, and therefor you have horns and voight tubes and all sorts of other "shoot offs" of this concept.

If you want to know more about exactly what your box is doing, I'd suggest doing a sweep with the ARTA software package (using LIMP) and seeing what your impedance plot looks like.
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Old 04-12-2013, 05:51 AM
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are u sure its not 56 sq inches of port area?
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Old 04-12-2013, 08:33 AM
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Quote:
Originally Posted by SPLEclipse View Post
The problem with t-lines is there's several "versions" of what they are, some of which are in conflict with each other. In a very strict sense, a TL design is one that aligns impedance throughout the spectrum with no tuned resonance at all. More commonly, the 1/4 (or 1/2, or even full) wave TLs are mass loaded tuned enclosures just like a regular ported box, except with much lower group delay and a smoother drop-off on the low end similar to IB. Of course, the term "transmission" implies directivity, and therefor you have horns and voight tubes and all sorts of other "shoot offs" of this concept.

If you want to know more about exactly what your box is doing, I'd suggest doing a sweep with the ARTA software package (using LIMP) and seeing what your impedance plot looks like.
I guess with two 8s mine would have to be an 1/8th wave since the 1/4 would be 50 in per 8 inch sub. I was probably just drunk and over thinking it last night lol but with my limited knowledge I can't figure out how it's possible my 1.5s on 200 less watts get louder and lower than his v2s on a similar tuned box.

Most obvious difference between the two being mine has almost double the port length.





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Originally Posted by GiGLZ View Post
are u sure its not 56 sq inches of port area?
I have just over 28 sq/inches of port area for the pair.

sent from my gs3
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Old 04-18-2013, 11:18 AM
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So you are comparing his setup to yours?
Do you have pics of the box?
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Old 04-18-2013, 12:08 PM
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In a way yes. Just trying to understand the relationship of port length to output but not in terms of tuning. His has a much shorter port that the guy who built it says puts it about the same tuning as mine. His plays nice and flat down to his tuning, whereas mine has quite a bit of kick at the upper frequencies but is a lot louder down at 30-40.

If you know of any links I could check out to read that would be awesome. Have Googled around but don't know exactly how to search what I'm looking for.

Don't have any pics of his but here's some of mine. Keep in mind, first time build lol

Don't know what happened to the finished pic, but I think you can get an idea of how the port runs and what it would look like done.

sent from my gs3
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Old 04-18-2013, 12:42 PM
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Every enclosure has 1/4 wave tendency's. technically there isn't to much of a difference between a ported box and tline.
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Old 04-18-2013, 12:50 PM
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Quote:
Originally Posted by korey_hofer View Post
Every enclosure has 1/4 wave tendency's. technically there isn't to much of a difference between a ported box and tline.
"Technically"? care to elaborate?
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