Design concept comments. Small sub TL trio. 1+2helpers. - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 15th July 2007, 02:48 AM   #1
diyAudio Member
GuyPanico's Avatar
Join Date: Mar 2005
Location: Euless, TX
Default Design concept comments. Small sub TL trio. 1+2helpers.

I'd just like to see if anyone has any comments on this concept. I realize a single 12" is more practical, and will most likely outperform this idea. But as a concept, I would just like to explore the pro's and con's of the idea.

The first sub will simply be tuned to the drivers FS like a normal TL sub. The other two subs, will be tuned to between 1/2 to 2/3, FS. Then they will be wired together in series, then in parallel to the first sub. With the "helper" subs wired in series they will recieve less power but have more cone area then the single driver so for the same frequency, they will be able to play the volume at a lower excursion. This is why they are tuned lower.

The goal of this concept is not to simply increase the overall output of the whole system like having 3 duplicate subs would do. But instead to lower the F3 of system and keep a flatter response.

I may try this with a trio of TB W5-1138SM's. Tune one to 45hz, and the other two to 30hz. But with these being 4ohm drivers, it gives me a final impedance of 2.667ohms. This would work best with 8ohm drivers.
Attached Images
File Type: jpg 2-1trio.jpg (34.7 KB, 145 views)
  Reply With Quote
Old 15th July 2007, 09:21 AM   #2
Dr_EM is offline Dr_EM  United Kingdom
diyAudio Member
Dr_EM's Avatar
Join Date: Oct 2006
Location: Swindon
A very interesting idea. A single 12" like you say may have advantages in some areas, particularly sheer output, but this design could certainly have other advantages such as speed/impact (from the use of 3 motors as opposed to one) and a more controlled response.

My project has been a small TL sub similar to the PMC TLE1. Using two 6" drivers it doesn't create the most earth shattering output but it does have amazing extension and agility. Your design will likely produce more output with its 3 higher excursion drivers so you should have a winner for medium sized rooms and particulary music use.

The TB drivers don't initially seem ideal for TL use but the reviews show someone has used one with good results and with the special price I'd definately give it a go
  Reply With Quote
Old 15th July 2007, 01:01 PM   #3
diyAudio Member
GuyPanico's Avatar
Join Date: Mar 2005
Location: Euless, TX
Not only are they on special, but I was going to buy 2 of them anyway for another project. So it makes this a very low cost experiment. I'm just a little worried about these drivers quickly running out of excursion in a TL design.
  Reply With Quote
Old 15th July 2007, 06:00 PM   #4
diyAudio Member
GuyPanico's Avatar
Join Date: Mar 2005
Location: Euless, TX
If somebody could model this concept, I would greatly appreciate it. I dont have MJK's sheets to do the modelling myself.
  Reply With Quote


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
Beautiful and elegant concept design neil_kaye Analogue Source 3 2nd July 2009 06:32 AM
Simply curved TMW design concept alexcd Multi-Way 3 10th March 2009 04:00 AM
Subwoofer concept design VEC7OR Subwoofers 2 31st July 2005 07:16 PM
Radical PCB design concept SY Everything Else 3 10th August 2004 07:31 AM

New To Site? Need Help?

All times are GMT. The time now is 10:13 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2