T-Line Enclosures

[DDSC 10+ year member]

(Speed of sound in inches/second) / (4*Frequency in hz) = wavelength in inches
Transmission line enclosures do not always need to have the line area equal to the cone area nor does it always need to exceed it. This can work but is often not necessary. In order to find out how much line area you need, you need to consider the resistance factor of the driver, the shape function of the line (line taper and line frequency), the Sd, and the Re/(BL^2) product. That will give you an idea of how much line area would be optimal for the driver. Changing the line taper and line area will affect the frequency response and low frequency extension of the system. If the line area is too small for the mounting depth of the driver, it's possible to add a compression chamber for the speaker to fit.

Transmission line enclosures don't have to be as large as people think. I fit one in smaller dimensions than I fit a 2.2 cube ported enclosure. It had better efficiency; low frequency extension; power handling (mechanical power handling increased around 15-25hz); and transient response.

They are not going to be the best for getting loud at a single frequency but will offer a very musical and very efficient enclosure with a low end that is effortless and full. That is if the design is well implemented for the driver and vehicle.

Will it move gobbs of air//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[Rashaddd 5,000+ posts]

Will it move gobbs of air//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

three gobbs to be exact

 

[poundindak69]

three gobbs to be exact

i was hopein for 4 gobbs:crap:

 

[Rashaddd 5,000+ posts]

i was hopein for 4 gobbs:crap:

If you wire two in series you could have 6 gobbs //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[rollerdj 10+ year member]

overall, how much bigger are the t-line boxes vs a standard ported box? i might have to try one.

 

[Rashaddd 5,000+ posts]

overall, how much bigger are the t-line boxes vs a standard ported box? i might have to try one.

If you use the full cone area, quite a bit

 

[rollerdj 10+ year member]

hummm. i was thinking about doing one for a single 10.

 

[Rashaddd 5,000+ posts]

hummm. i was thinking about doing one for a single 10.

that oem? I'm going to be building one for the same sub soon most likely

lets put it this way, for a single 10, at 30hz, the box will have over 3 cubes of internal airspace assuming you use the full cone area

 

[rollerdj 10+ year member]

no, that one is for sale. i got a pair of SI baby mag's i might make a t-line for. but the most i really wanna do is 2.5 cubes and still try to keep room for other stuff.

 

[twisztdauthorit 10+ year member]

Bringing an old thread back. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Id like to learn more about how the compression chamber works, or atleast how to calculate it into the t-line if possible.

Im gonna go out on a ledge and try to design and build a t-line for an 18" sub. Obviously this wont be for a car. Tuning will be around 24 hz thinking of a tapered design about 1.2 - 0.5 or so.

Plan on using this sub

http://www.soundsolutionsaudio.com/zencart/index.php?main_page=product_info&cPath=2_18&products_id=56

Im stubborn and a DIY type of guy so please dont come to me offering ur services for $... just yet

 

[sinosic 10+ year member]

edit double post

 

[sinosic 10+ year member]

That's a bad tutorial.

its not bad. its not the best but it works. i have made three different t-lines for 3 different subs and was surprised with all of them. they all got loud with about half the rms power. but i noticed that its was easy to push the sub to hard. also i used a eq to even the responce out. without the use of an eq all three had a noticable increase in output around the tuning of the line.

i think because of transfer function his tuturial does work.

mr. immacomputer im know you can design a better t-line than ken, ken is the guys name who wrote that tutorial. but kens method does work as long as the sub's qts and qms are with in range and you follow his directions well.