Dynaudio 12" transmission line subwoofer - Page 2 - 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 30th September 2012, 11:01 PM   #11
bjorno is offline bjorno  Sweden
diyAudio Member
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Originally Posted by d1030180 View Post
I certainly hope not! I thought it would be quite OK with many bracing panels & sticks & triangles added inside the enclosure?

Here is a picture of one bracing panel glued and screwed, I didn't have enough time to finish installing the others on this weekend.

Hopefully I have some time to install the remaining panels next weekend! And also to add some triangular-shaped vertical braces.
Hi d1030180,

Agree, Looks to be a well built design..

An late answer for Post#7:

Attached Images
File Type: jpg Acoustic dampning-SMALL_b.JPG (251.4 KB, 260 views)
  Reply With Quote
Old 7th October 2012, 02:07 PM   #12
diyAudio Member
Join Date: Jun 2012
Thanks for your information, bjorno

I glued a couple of support triangles into the enclosure and made a cutout for the driver.
It still needs a few more triangles and attachment of the side panel... So far it's looking good.
Attached Images
File Type: jpg IMGP2963.JPG (813.8 KB, 235 views)
  Reply With Quote
Old 25th November 2012, 01:12 PM   #13
diyAudio Member
Join Date: Jun 2012
I have recently been testing a sealed prototype of this sub.

The sub integrates nicely with the main speakers after stuffing their ports tightly with cotton wadding. I get the best sound when I set the plate amp's crossover frequency to 40 Hz and volume to around 40 %. With these settings I find its sound very good indeed, at least with music material. Its output is definitely more impressive than the compact 10" subwoofer which I finished building during last summer.

With the port opening closed by a piece of MDF and no enclosure stuffing I measured a resonance peak at 35 Hz. I don't have any way to measure the frequency response, but after testing with some test tracks it seems to extend at least down to 25 Hz. According to the simulation based on the location of the impedance peak, the total Q should be around 0,68..0,70.

The crossover is still a bit high for me and I'm planning to change some components in the filter section to attain a slightly lower adjustment range. Maybe something like 30-100 Hz instead of current 40-160 Hz. I've already modified the filter to get rid of the in-built peaking (+6 dB/40 Hz) second order high-pass filter.

I still need to decide which plate amplifier should I be using with this sub. Currently the enclosure has a slight leak in one of the bottom corners, so I would need to cut a hole anyway to be able to reach all the corners for applying wood glue.
Attached Images
File Type: jpeg imgp3187.jpeg (150.3 KB, 164 views)
File Type: jpeg imgp3186.jpeg (115.2 KB, 151 views)
  Reply With Quote
Old 16th February 2013, 10:23 PM   #14
diyAudio Member
Join Date: Jun 2012
Finally had some free time for applying some putty and sanding to smooth out the gaps and small imperfections. The finish won't be perfect as the surface of the wood material itself is not totally straight; however this is not such a big problem for me.
Attached Images
File Type: jpg IMGP3476.JPG (479.9 KB, 95 views)
  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
Large Transmission Line Subs - 12"+ 2MuchRiceMakesMeSick Subwoofers 0 5th January 2012 08:07 PM
FS: Fried "O" Transmission Line Subwoofer jimbones Swap Meet 4 20th October 2011 10:13 PM
Chris's Transmission Line Subwoofer Project rick57 Subwoofers 0 21st May 2007 01:47 PM
subwoofer transmission line dcampbell1955 Subwoofers 6 10th December 2003 05:23 PM
Transmission line subwoofer question Street Subwoofers 16 14th August 2003 02:33 AM

New To Site? Need Help?

All times are GMT. The time now is 05:05 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