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T-line boxes
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<blockquote data-quote="Moble Enclosurs" data-source="post: 7468423" data-attributes="member: 634917"><p>Incorrect. A chambered transmission line is not the same as a vented enclosure with a fancy name. It is actually designed quite differently. In reality, the design of a tline has no similarities to a ported enclosure(basic) at all, even with a compression chamber. Also, it is not based on a simple quarter wave theory, though, back in the 1940s, this was all they had to go from. Now, other factors have been considered that control much more than just a "tuning". In fact, tuning is not even related to a tline, if done properly, nor does quarter wave technology. It is best to rely on half wave resonance if anything. Expansion or tapering the line also gives it much different characteristics than a "ported" box. It does not have to be used for a specific response curve, but can be controlled in most cases to replicate the anechoic response of a driver, which in turn causes a very controlled SQ response, but if that driver is designed for mainly SPL, such as the SA drivers, it can be used efficiently for that as well. Most believe that using a standard quarter wave along with a line area of the square area of the driver, that this will give best results. This cannot be further from the truth, as it is relative to the design goal, but if you were to design one without any knowledge of it at all, using those basics will give you a decent output for SQL. I would never recommend it though.</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7468423, member: 634917"] Incorrect. A chambered transmission line is not the same as a vented enclosure with a fancy name. It is actually designed quite differently. In reality, the design of a tline has no similarities to a ported enclosure(basic) at all, even with a compression chamber. Also, it is not based on a simple quarter wave theory, though, back in the 1940s, this was all they had to go from. Now, other factors have been considered that control much more than just a "tuning". In fact, tuning is not even related to a tline, if done properly, nor does quarter wave technology. It is best to rely on half wave resonance if anything. Expansion or tapering the line also gives it much different characteristics than a "ported" box. It does not have to be used for a specific response curve, but can be controlled in most cases to replicate the anechoic response of a driver, which in turn causes a very controlled SQ response, but if that driver is designed for mainly SPL, such as the SA drivers, it can be used efficiently for that as well. Most believe that using a standard quarter wave along with a line area of the square area of the driver, that this will give best results. This cannot be further from the truth, as it is relative to the design goal, but if you were to design one without any knowledge of it at all, using those basics will give you a decent output for SQL. I would never recommend it though. [/QUOTE]
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