t-line

[kwitcherbichin 10+ year member]

r these boxes made to get loud or sq or what...

Click to read more...

 

[snoopdan 5,000+ posts]

r these boxes made to get loud or sq or what...

either, depends on what ya wanna do. I've got one of my t-lines to do 155.7 @65 hz

 

[Tone415 10+ year member]

either, depends on what ya wanna do. I've got one of my t-lines to do 155.7 @65 hz

65?! or 35?

 

[kwitcherbichin 10+ year member]

cause my buddy is talkin bout tlines dont make pressure or some crap...

 

[groundpound4200 5,000+ posts]

this one sounded pretty good for me... got loud too

 

[ciaonzo 5,000+ posts]

Why not just use your little clicking finger to search the innerwebz for articles pertaining to properly designed transmission lines, or design theory and how they're intended to perform?

 

[kwitcherbichin 10+ year member]

Why not just use your little clicking finger to search the innerwebz for articles pertaining to properly designed transmission lines, or design theory and how they're intended to perform?

because i would rather ask it and let ur little fingers do it for me ;]

 

[brmcm15 10+ year member]

A perfect transmission line enclosure has an infinitely long line, stuffed with absorbent material such that all the rear radiation of the driver is fully absorbed, down to the lowest frequencies. Theoretically, the vent at the far end could be closed or open with no difference in performance. The density of and material used for the stuffing is critical, as too much stuffing will cause reflections due to back-pressure, whilst insufficient stuffing will allow sound to pass through to the vent. Stuffing often is of different materials and densities close to the cone, and changes as one gets further from the cone.

Consequent to the above, practical Transmission Line loudspeakers are not true Transmission Lines, as there is generally output from the vent at the lowest frequencies. They can be thought of as a waveguide in which the structure shifts the phase of the driver's rear output by at least 90°, thereby reinforcing the frequencies near the driver's Fs. Transmission lines tend to be larger than ported enclosures of approximately comparable performance, due to the size and length of the guide required (typically 1/4th the longest wavelength of interest).

The design is often described as non-resonant, and some designs are sufficiently stuffed with absorbent material that there is indeed not much output from the line's port. But it is the inherent resonance (typically at 1/4 wavelength) that can enhance the bass response in this type of enclosure, albeit with less absorbent stuffing. Among the first examples of this enclosure design approach were the projects published in Wireless World by Bailey in the early 1970s, and the commercial designs of the now defunct IMF Electronics which received critical acclaim at about the same time.

A variation on the transmission line enclosure uses a tapered tube, with the terminus (opening/port) having a smaller area than the throat. The tapering tube can be coiled for lower frequency driver enclosures to reduce the dimensions of the speaker system, resulting in a seashell like appearance. Bose uses similar patented technology on their Wave and Acoustic Waveguide music systems.[5] Bowers & Wilkins have used this approach in their flagship Nautilus speaker as well as smaller straight tapering tubes in many of their other lines.[citation needed]

Numerical simulations by George L. Augspurger and Martin J. King have helped refine the theory and practical design of these systems.[6][7]

wiki

 

[kwitcherbichin 10+ year member]

so a box for 2 15s in a t-line would be massive huh...

 

[snoopdan 5,000+ posts]

65?! or 35?

65 ... was just a burp box. That was with only one 18"

 

[Savstyle 10+ year member]

so a box for 2 15s in a t-line would be massive huh...

Yeah pretty big

Last one me and my buddy built was 4.5cubes for a single 15"

And it wasnt a box hungry sub. So its pretty dependent on the sub.

 

[kwitcherbichin 10+ year member]

i see, well i wanna do a box with ridiculous output for moving air. i still cant get over the fact that my box sounds the way it does... the osb box is still crazy for the materials that it was made from...

how do u get good air flow from a box with lows, is it the way the port is or the tuning...