T-Line sub enclosures
Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=52096
Printed Date: May 03, 2024 at 11:51 AM
Topic: T-Line sub enclosures
Posted By: Forevrbumpn
Subject: T-Line sub enclosures
Date Posted: March 18, 2005 at 12:29 AM
I was wondering if anyone in here has tried T-Line enclosures in cars? I do alot of home/car audio speaker building/ testing, and I have some plans I have done alot of research on for T-Line. If nobody knows, T-Line is pretty much the perfect sub enclosure. A box that is just a long port, with area that equals to Sd x Fs wavelength. I cant wait to see the results, so I just wanted to hear from you guys in here if anyone has attempted T-Line before, thanks.
Replies:
Posted By: Ravendarat
Date Posted: March 18, 2005 at 10:36 AM
Do a forum search on here as someone did one about a month and a half ago with complete pictures and what not. I think it was with a JL sub but I cant remember now
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Posted By: customsuburb
Date Posted: March 19, 2005 at 7:08 PM
I made a t-line box. It sounds great! I used an 8" JL W0. Here's a post with pictures I did. https://www.the12volt.com/installbay/forum_posts.asp?tid=48412&KW=transmission+line-------------
Posted By: Forevrbumpn
Date Posted: March 20, 2005 at 12:51 AM
Looks pretty good, I just finished a box I made, only for testing the T-line design theory, only a 6.25" subwoofer, and I had it hooked up to the sub channel of my Memphis Bell 1300 (about 250rms@6ohms) And I was like "Wow, a 6" sub?" I disconected my Kove 15", hooked this puppy up, and I was really impressed. So now I have my little tested method on a 6", time to move up in size. The way I did it, was to keep the box as aerodynamic as possible. I used only 1/8" ply wood for the top and bottom, 3/4" mdf for wave seperation , and baffle board. It looks like, from the side, a arrow point, or side view of a wing. I will see if I can get pics in here... 30kbs is kinda small
Posted By: haemphyst
Date Posted: March 20, 2005 at 1:05 AM
Forevrbumpn wrote:
A box that is just a long port, with area that equals to Sd x Fs wavelength.
And there is SO MUCH more to it than that. You are going to find quite quickly that if you use this formula as the bible, you are going to be building boxes that are too big to even FIT in a car! ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: Forevrbumpn
Date Posted: March 20, 2005 at 2:12 AM
Iam more interested in it for Home audio, compared to car audio. But Car audio is where I want to start. As far as home, I have Leap/LMS at work to help with design. I just got bored with port design, and what porting lacks.
Posted By: MAXST
Date Posted: March 21, 2005 at 3:53 PM
customsuburb i was looking at those plans you gave me on that box...some reason the measurements look wrong.
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Posted By: oonikfraleyoo
Date Posted: March 22, 2005 at 12:31 PM
Where would be a good place to start reading about TL design? ------------- Nik
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Posted By: Forevrbumpn
Date Posted: March 22, 2005 at 9:51 PM
I just built my 3rd T-Line, and this one sounds great. Its just a 8" driver, tunned to 30hz. The formula SDxFs, does make large box designs, but so far, Ive noticed it works great. The 8" has 9.5' of port length at 30.5sq-inch port area, so the total cubic feet came to be 2cf total dimensions are 4'x2' x6.5" ( used 2 quarter sheets of 5/8"s MDF) and the port bended 3times in the box. Still, just testing the box design, but for something so simple in design, it sounds really awsome. I have been installing for over 10yrs, and working in the speaker driver design for 3yrs, I have seen systems come and go, high end, and low end, and for $40 in wood, it kicks a$$
Posted By: MAXST
Date Posted: March 23, 2005 at 11:16 AM
pictures!  ------------- I need quality equipment, feel free to donate.
Posted By: Forevrbumpn
Date Posted: March 24, 2005 at 12:26 AM
I have no idea how to load 150k pics, as a 30k pic, that or its emails
Posted By: MAXST
Date Posted: March 24, 2005 at 1:57 PM
open it up in paint, then go to image...then stretch/skew..
then like try 50% on both or down to 35% i just sized this to show you...
 ------------- I need quality equipment, feel free to donate.
Posted By: Forevrbumpn
Date Posted: March 24, 2005 at 9:12 PM
Think I did it, This is a cut-away view of the box. Its 6.75" deep, 2ftx4ft, internal port volumn equaled 2cf. I filled with poly fill till' it sounded right (alot of prying and nailing the front panel back and forth)
Posted By: oonikfraleyoo
Date Posted: March 25, 2005 at 9:40 AM
------------- Nik
Jeeputer Progress
[|||||||||||-] 90%
Check it out.
Posted By: MAXST
Date Posted: March 26, 2005 at 12:13 AM
wheres the driver?
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I need quality equipment, feel free to donate.
Posted By: Forevrbumpn
Date Posted: March 26, 2005 at 12:17 AM
Lower left hand corner, covered with fill
Posted By: overworked2
Date Posted: March 26, 2005 at 8:23 AM
Ok, I guess I have had my head so far up a GPS receivers backside to even know about these until I looked in here and wondered what brand of Boxes a T-Line is...wow! Alright So went a bit over board when I decided to build one.....I used a 15: VDO Dayton...Oh my lord does it rumble! and low?! struth mate it's incredible! I have sinced removed the remaining 2 15's out my wagon and installed this into it alone, amps happier battery is happier...but how can I stop my roof braces from vibrating so much? I have given up trying to stop so much rear hatch rattle and am now concentrating on roof braces. ------------- Check all advice given with a meter
Posted By: DYohn
Date Posted: March 26, 2005 at 9:48 AM
Nice job, oonikfraleyoo. It doesn't look like you tapered your line though. This will cause boominess and your tuning frequency to be off. ------------- Support the12volt.com
Posted By: Forevrbumpn
Date Posted: March 26, 2005 at 12:58 PM
Yea I noticed it to be a litle boomy, but its actually still a very accurate design. That was just a test box to try the whole thing out, after the 6" sub design. This weekend Iam going for a ACI 10" and also a 12" Magnum Spl driver I sold to a friend. The 10" will be tuned around 24hz, and the 12" sub about 35hz. And these boxes will be alot smaller than that 8" enclosure ( wich again, was just a tower sub enclosure)
Posted By: oonikfraleyoo
Date Posted: March 26, 2005 at 5:49 PM
DYohn, I didn't build that Forevrbumpn did. I just put the .jpg on the end of the link. ------------- Nik
Jeeputer Progress
[|||||||||||-] 90%
Check it out.
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