Underground Sub - 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 15th March 2013, 12:47 PM   #11
diyAudio Member
Join Date: Feb 2012
Location: Brisvegas
bjorno that looks very interesting... imagine an 8 horn loaded DBA flush mounted in cavities behind the front and rear walls. You would just see 8 square holes in the walls and no subs.

What I do like about the idea is no pressurization of the room. Which I am sure OB speakers would greatly appreciate, especially the RAAL dipole ribbons.

Just doing the math on a 6 meter wide room and it is reduces the horizontal room mode cut off to 172 / 3 = roughly 57Hz. Starting to loose much of the advantage of this type of design.

With 3 meter center to center screen size will be touch and go depending on the size of the outlets.

Last edited by Silent Screamer; 15th March 2013 at 01:03 PM.
  Reply With Quote
Old 15th March 2013, 01:19 PM   #12
Ile is offline Ile  Finland
diyAudio Member
Join Date: Sep 2011
Location: Jyväskylä
Originally Posted by Silent Screamer View Post
Not sure what you mean by manifolds.... but how about this?
You should read IB FAQ I posted.

Manifold is kind of connection box for IB sub elements, usually mounted to back space side. Normally 2 or 4 element is connected to opposite sides of box...
IB subwoofer picture gallery page 1

Don't build that kind horns from your head, result would suck without good design.

Don't understand what benefits much complicated horn have over very simple IB for hometheater subwoofer. Maybe you save two driver price and can use smaller amp, but construction is so much complicated that you lose many times that to material costs and time used.
Hard to say which would sound better, because probably no one have build both to same room.
  Reply With Quote
Old 15th March 2013, 01:40 PM   #13
diyAudio Member
Join Date: Feb 2012
Location: Brisvegas
I tried modeling the DBA bjorno suggested and it just won't work, using a modest 600mm square outlets, it only gives a 100 inch diagonal 16:9 picture, which is not enough, and I don't want to try material over the ports to make the screen bigger, so that leave me back at either IB or TH.

Thanks Ile I will investigate the IB option in greater details.
Attached Images
File Type: jpg Home Theatre Room 5.jpg (31.8 KB, 206 views)
  Reply With Quote
Old 15th March 2013, 02:05 PM   #14
epa is online now epa  Netherlands
diyAudio Member
Join Date: Apr 2010
Location: amsterdam
maybe 4 tcsound 18"tqwtp with the mouth positions as in bjorno's link.
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
  Reply With Quote
Old 15th March 2013, 11:18 PM   #15
diyAudio Member
Join Date: Feb 2012
Location: Brisvegas
I'm not sure you would get the same effect if you deviate from the 1/4 - 3/4 placement, but there is no reason I couldn't still use the idea even if its not perfect for more even bass distribution.

Just working with the IB idea for a moment I could use the master bedroom directly above the home theatre room to provide a chamber for the IB.

Perhaps with it vented it would result in non pressurization of the room as it would be a back and forth motion with a large air buffer in between.
Attached Images
File Type: jpg Home Theatre Room 6.jpg (44.2 KB, 147 views)
  Reply With Quote
Old 15th March 2013, 11:53 PM   #16
3GGG is offline 3GGG  Australia
diyAudio Member
Join Date: Mar 2010
I am going to build LeCleach bass horns, to go with a 4 way horn build. After hearing the effortless dynamics and detail fr horns I just have to try a 20hz concrete bass horn. I will detail the build and feel free to jump on a cheap flight for a listen when complete.
  Reply With Quote
Old 16th March 2013, 12:39 AM   #17
diyAudio Member
Join Date: Feb 2012
Location: Brisvegas
Sounds interesting 3GGG.

The boss expressed her displeasure with me using the master bedroom to vent the home theatre room, on the account of she says it should be separate for privacy reasons...

With just the two of us in the house I don't see who we are going to upset

I asked if it was ok to build it into the 3 x 6 meter walk in wardrobe, and that was far more acceptable, as it would be separate from the bedroom.

I could use the whole room, but there's no point in rocking the boat unnecessarily when it is still just an idea...
Attached Images
File Type: jpg Home Theatre Room 7.jpg (50.6 KB, 146 views)

Last edited by Silent Screamer; 16th March 2013 at 12:42 AM.
  Reply With Quote
Old 16th March 2013, 01:38 AM   #18
diyAudio Member
Speedskater's Avatar
Join Date: Sep 2002
Location: Lakewood, Ohio
Let me see if I can find the old link to Tom P's multiple subs.
And the magazine writer who had floor to ceiling columns in his basement with multiple drivers.
  Reply With Quote
Old 16th March 2013, 02:28 AM   #19
diyAudio Member
Join Date: Feb 2013
If you build a speaker under the basement floor, what happens when your sewer backs up and your sump pump motor is burnt out?
  Reply With Quote
Old 16th March 2013, 02:49 AM   #20
OllBoll is offline OllBoll  Sweden
diyAudio Member
Join Date: Nov 2010
If you're going to build such an extreme build then you might consider to use twice as many drivers and slot mount them where one is reversed. This would reduce driver significantly distortion and cancel mechanical forces. Your house will thank you when playing lots of LFE content

There is a thread about this, also some information on Linkwitzlab since he uses the technique himself a lot.

If you go this route you could compensate by using smaller less fancy drivers since the strain on each driver is reduced.
  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
Unheard, Underestimated, Underground Music zayne742 Music 18 16th February 2008 05:20 PM
There is water flowing underground.... ptwining Multi-Way 10 8th August 2006 03:49 PM

New To Site? Need Help?

All times are GMT. The time now is 03:59 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