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Old 15th March 2013, 12:44 AM   #1
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Default Underground Sub

In the not too distant future I plan to build a new house and I want to build the house around the home theatre room. I have already started a thread here about the room http://www.diyaudio.com/forums/everything-else/231732-your-chance-help-build-ultimate-home-theatre-listening-room.html , but I would like to spawn a separate thread to discuss just the underground sub part of the room.

I have attached some very rough thoughts (size of room hasn’t even been determined yet but thinking around 6 meters wide and 8-10 meters long) but I don’t have a track record of building successful subwoofers, and I would really appreciate the experience of those that have built wild subwoofers before.

For drivers I am thinking of a pair of TC Sounds Ultra 5400’s, but even those are subject to suggestion. I have seen several websites with underground horns and different types of cavities but based on the drivers I want to use can you please suggest what an ultimate box for this purpose might look like.

Please bear in mind that a concrete floor needs to be poured over the sub enclosure.
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File Type: jpg Home Theatre Room.jpg (57.6 KB, 363 views)

Last edited by Silent Screamer; 15th March 2013 at 12:46 AM.
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Old 15th March 2013, 01:55 AM   #2
xrk971 is offline xrk971  United States
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Check this out. 110 dB/W/m at 10 Hz!
The World's Biggest Subwoofer ~ Damn Cool Pictures

As far as box designs, I think the tapped horns are the way to go.

Last edited by xrk971; 15th March 2013 at 01:57 AM.
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Old 15th March 2013, 03:22 AM   #3
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Thanks xrk971 that website was linked in the other thread. I would like to do a tapped horn but I really don't know how to use Hornsresp properly.

The main advantage I would have over that guy, is he is working with an existing building and is limited by what he has. If I could work out how to design the horn I could do the horn without the turn.

I probably wouldn't want to go over the top with 16 drivers, but a couple of nice 18" TC sounds drivers in the right enclosure would make for a tidy home theatre
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Old 15th March 2013, 07:52 AM   #4
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Spent a bit of time refining the idea. Would introducing the sub into the back of the room be a problem?
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File Type: jpg Home Theatre Room 2.jpg (58.2 KB, 325 views)
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Old 15th March 2013, 08:38 AM   #5
seanny is offline seanny  United States
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How are you going to mount the drivers?
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Old 15th March 2013, 08:41 AM   #6
Ile is offline Ile  Finland
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Here's my similar but bit smaller scale IB sub project.
Concrete IB subwoofer

For your size theather I'd go with 4 x IB318 located at front wall, 2 x 2 manifolds at 1/4 and 3/4 along front wall should eliminate rooms width mode and give similar response to all seats at same row (in theory).

I guess back wall location could cause challenges to phase with front speakers.

IB sub FAQ
IB subwoofer FAQ page

and dedicated forum
"Cult of the Infinitely Baffled"Hear The Bass, Not The Box The definitive online resource for Infinite Baffle subwoofer designEstablished 1999 - Home

Last edited by Ile; 15th March 2013 at 08:46 AM.
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Old 15th March 2013, 10:34 AM   #7
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Not sure what you mean by manifolds.... but how about this?
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Old 15th March 2013, 10:45 AM   #8
more10 is offline more10  Sweden
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I would build a le cleach bass horn:

Click the image to open in full size.
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Old 15th March 2013, 10:55 AM   #9
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Hi more10 the problem is I can't even get a decent result out of Hornresp as it is, there is no way I could ever design anything that involved.

Using OB speakers I really would like to get the subs out of the room to give me better speaker placement, and being that I have the option to build whatever I want before the house get put on top, it would be best to try use one of the space hungry designs first.

Not sure which design is going to give the best results...
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Old 15th March 2013, 10:56 AM   #10
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Silent Screamer View Post
Not sure what you mean by manifolds.... but how about this?
...or this:

Red Spade Audio: Double Bass Array (DBA) bass integration

If I had the opportunity to design a HT room from scratch and for frequencies below ~80 Hz I would pick this method as it eliminates nearly all room influences for
an arbitrarily seated listener.

b
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