Help Designing TL - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd March 2008, 01:48 AM   #1
h22lude is offline h22lude  United States
diyAudio Member
 
Join Date: Mar 2008
Question Help Designing TL

I am currently trying to design a TL enclosure but am having quite a few bumps along the way as far as understanding how to come up with dimensions. I have built many sealed and ported enclosures successfully.

I have already spent quite a bit of time at the tlinespeakers.org and quarter-wave.com and still do not understand how to fully calculate enclosure specs for a TL.

If anyone could help me get going in the right direction I would greatly appreciate it.

I need help understanding how to calculate line length and how do you measure the line length of the box? is it from the speaker opening all the way to the port end?

And after calculating the line length how do you determine the box height and line width.

Does tapering have a big advantage? Should the box end up having a specific volume in the end?

Sorry for so many questions i'm just really interested in this box design and would like to learn to build my first oen so i can experiment from there. Thanks for your time!

My driver specs are:
Model: 05C154
Nominal Impedance(Ohms): 4
SPL dB 1W/1M: 90.2
Displacement, cc: 3260
Displacement, cu.in.: 198.7
Hole cutout, in dia: 13 7/8
Mounting Depth, in.: 7 3/8
Revc: 3.32
VC Inductance, mH: 3.44
Sd, m3: 0.0856
BL: 15.32
Vas, Liters: 272.329
Vas, CuFt: 9.62
Moving Mass , oz.: 7.38
Fs:21.68
Qms: 11.2
Qes: 0.397
Qts: 0.383
Peak Power Handling, watts: 500
EXmax, mm: 11.53
  Reply With Quote
Old 3rd March 2008, 04:06 AM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
One thing i'll say right off the bat is that the TL will be BIG (i guess to be expected for a 15")

1st thing to do is pop the parameters into Martin's tables, this will give you an idea.

The higher the taper the smaller the box (in general). The taper helps improve the terminus low pass function meaning that you can get away with less damping and get more bass out of it.

You will get pretty good results right out of the tables but if you want to play further you need to play with the TL in Martin's software.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 3rd March 2008, 06:54 AM   #3
h22lude is offline h22lude  United States
diyAudio Member
 
Join Date: Mar 2008
Okay thanks for the response that helps alot ill definately be tapering than. The tables your referring to are the one's i have to buy right?? Will the tables help me out substantially with what im trying to do? I just wasn't sure if they would help me with what i needed and did not want to waste my money.. Thanks!!
  Reply With Quote
Old 3rd March 2008, 07:31 AM   #4
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
The tables are free... the software costs a very modest amount.

http://www.quarter-wave.com/TLs/TL_Theory.html

near the bottom.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 3rd March 2008, 01:49 PM   #5
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
If anyone could help me get going in the right direction I would greatly appreciate it.
Hi,

FYI: An example simulation of many possible where the line length is kept short: 1(2)

b

1(2)
Attached Images
File Type: gif 15in-05c154-tl.gif (33.2 KB, 265 views)
  Reply With Quote
Old 3rd March 2008, 01:50 PM   #6
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
2(2)
Attached Images
File Type: gif 15in-05c154-tl-plots.gif (55.5 KB, 238 views)
  Reply With Quote
Old 3rd March 2008, 02:30 PM   #7
h22lude is offline h22lude  United States
diyAudio Member
 
Join Date: Mar 2008
Okay thanks planet10 and bjorno! That definately got my wheels moving again.. Ill keep looking further into these tables and see what problems i run into. Thanks again!
  Reply With Quote
Old 3rd March 2008, 03:01 PM   #8
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Hi,

Discard attachment 1(2) here above which now is updated.
Correcting a mistake when cut and paste the FR plots: See the picture 1(1).

b
Attached Images
File Type: gif 15in-05c154-tl_rev.gif (33.8 KB, 232 views)
  Reply With Quote
Old 4th March 2008, 03:51 AM   #9
h22lude is offline h22lude  United States
diyAudio Member
 
Join Date: Mar 2008
Wow so that definately ended up being a LOT bigger than I thought. What numbers from the driver determine the volume of the box? Is there any other way to make the box smaller? Otherwise would the driver below be substantially smaller? Im looking for the box to be 5 cu ft max. Is that possible? Or am I better off just going with a vented enclosure...

Thanks for all the help so far! It's very much appreciated!


Model:06S8L72
Nominal Impedance(Ohms)2
SPL dB 1W/1M:83.4
Displacement, cc:980
Displacement, cu.in.:59.8
Hole cutout, in dia:7 5/8
Mounting Depth, in.:4 11/16
Revc:3.305
VC Inductance, mH:2.77
Sd, m3:0.0273
BL:14.29
Vas, Liters:10.075
Vas, CuFt:0.36
Moving Mass , oz.:4.83
Fs:44.1
Qms:7.064
Qes:0.614
Qts:0.5645
Peak Power Handling, watts:900
EXmax, mm:12.2
  Reply With Quote
Old 4th March 2008, 05:22 AM   #10
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Fs, Vas, Qts sets box size and for a TL its length is normally a function of Fs, so a low Fs combined with a high Vas and medium Qts = big box. Even tuning the 05C154 up around 60 Hz requires ~6.5 ft^3 and a T/S max flat vented alignment is 9+ ft^3, so no help there. A prosound vented alignment OTOH is only ~3.7 ft^3, though of course not much deep bass output either:

Vb = 3.684 ft^3 net
port = 5" dia. x 24"

BTW, what brand drivers are these?

GM
Attached Images
File Type: gif 05c154 pi align.gif (6.7 KB, 200 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help designing HPF add-on shaaregeulah Solid State 0 2nd May 2008 05:35 PM
Help designing a new set-up. djames03 Car Audio 4 12th May 2006 03:32 PM
Help please, designing a TL sub ShinOBIWAN Subwoofers 12 1st July 2004 04:14 PM
Designing for guys who like designing Sch3mat1c Tubes / Valves 14 31st August 2003 11:46 AM
This is the DAC which I`m designing purer Digital Source 12 26th July 2003 01:56 AM


New To Site? Need Help?

All times are GMT. The time now is 06:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2