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Old 1st October 2011, 05:26 PM   #1
Ile is offline Ile  Finland
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Default Concrete IB subwoofer

Didn't find many IB builds around here, so I thought some might find this project interesting or least funny. It's based to two Fi IB318 drivers in 7.3 m3 sealed concrete enclosure, it's about ten times elements vas so I call it IB. Here's few shot during project.

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Now I have tested it and it seem to work as expected. Next I will build theater room over my subwoofer enclosure.

Here's my sort of build thread with more info and pictures.
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Old 1st October 2011, 09:07 PM   #2
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Hi there: Fabulous project! Hope you provide more details as the construction moves along. What is the black square surounding the driver (shown in the top side photo)? Are the drivers resting on rubber pads and then supported by the channel clips? I suppose the large boxout in the floor is for access to the drivers in the enclosure(?), what type of cover will be used in this opening? Will any lining be used in the enclosure? Is the enclosure moisture proofed for protection of the drivers? What crossover frequency will be used for the subs? ...regards, Michael
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Old 2nd October 2011, 04:13 AM   #3
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Now that is what you call a concrete speaker. I will have to have a word with my landlord.
Great stuff. cheers Dave.
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Old 2nd October 2011, 04:56 AM   #4
Pano is offline Pano  United States
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Fantastic stuff. And Wow! what a lot of work.

BTW, thanks for your Genelec photo in the other thread. Interesting wall treatment.
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Old 2nd October 2011, 05:21 AM   #5
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wow thats dedication to building a theater room! nuts!

are they strictly true sub woofers (40hz and lower?) where you don't care about direction? aka where will these be firing in relation to the listener/viewer
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Old 2nd October 2011, 06:13 AM   #6
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Where the hell is your dust mask?
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Old 2nd October 2011, 09:15 AM   #7
epa is offline epa  Netherlands
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CHEERS
i like your dedication.
i wish i had room to do this.
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
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Old 2nd October 2011, 10:58 AM   #8
Ile is offline Ile  Finland
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Quote:
Originally Posted by j.michael droke View Post
What is the black square surounding the driver (shown in the top side photo)?
Element embeddings are coated using polyester resin to prevent crumbling particles from concrete embeddings to go jumping over elements. I dyed second layer black just to test how it will work and embedding might look bit better when element grilles are removed.

Polyester also prevent moisture coming to heated theater from cold cellar. Other areas of that concrete floor will be insulated.

Quote:
Originally Posted by j.michael droke View Post
Are the drivers resting on rubber pads and then supported by the channel clips?
Those elements have c-profil shaped rubber surrounding ring for sealing.

Click the image to open in full size.

So I pressed elements to concrete empeddings "as is" using diy clamps.

Quote:
Originally Posted by j.michael droke View Post
I suppose the large boxout in the floor is for access to the drivers in the enclosure (?), what type of cover will be used in this opening?
Yes it will be cellar hatch to access elements, beer and potatos.

It already have weather strip sealed inner door made of film coated 3/4" plywood. There will be other one at floating floor level.

Quote:
Originally Posted by j.michael droke View Post
Will any lining be used in the enclosure? Is the enclosure moisture proofed for protection of the drivers? What crossover frequency will be used for the subs? ...regards, Michael
In theory it shouldn't need any lining inside, since it will be crossed at 80Hz (4.3m wave lenght) and modes shouldn't fit inside enclosure to cause problems. I'm not sure yet if this is true in practice. Have to make some measurements.

Cellar is pretty dry even it's been raining very much lately. Sure it have higher moisture than heated room, but surfaces are dry. It also have air ducts for venting. Elements are sort of moisture protected because those are made for car use, so I'm not very concerned about this.
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Old 2nd October 2011, 11:13 AM   #9
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And to think some people live in houses made from sticks and leaves.

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Old 2nd October 2011, 11:14 AM   #10
Ile is offline Ile  Finland
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Quote:
Originally Posted by Pano View Post
Fantastic stuff. And Wow! what a lot of work.
Thanks from kind words.

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Originally Posted by Pano View Post
BTW, thanks for your Genelec photo in the other thread. Interesting wall treatment.
This study covers their main auditory acoustical treatments.

Here's all their academic papers.
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