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Old 14th November 2009, 07:41 PM   #1
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Question Using fireplace and chimney to mount IB subs?

Hi,
First post here and it might seem a bit wierd but I have a problem finding a suitable location for my substage.

I wish to mount 2 IB subs in a fireplace and use the chimney to vent into the roof cavity.

The subs in question are the AE IB15's. I wish to mount them facing each other to minimise vibrations and seal them into the fireplace with a baffle.

Will the chimney be big enough to vent into the roof space without compressing the drivers? The chimney is about 3 feet wide and nearly 1 foot deep internally all the way to the roof cavity which is distance of about 7-8 feet.

Dont worry, the fireplace is no longer in use and the chimney through the roof has been removed when the new roof was put on. There are 2 other fireplaces in the house that are functional so its not a big deal(bought the house this way).

Ant
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Old 14th November 2009, 08:24 PM   #2
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Quick paint to help visualize. The red area will be open into the room. the blue area will be a flat baffle that seals the box and subs into the fireplace.

Ant
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Old 14th November 2009, 08:55 PM   #3
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Dude, that's totally cool. Reminds me of this.
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Old 15th November 2009, 09:36 AM   #4
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test the location out before building your open baffle by blocking the fireplace up and trying a normal sub in that location. Also check out: "Cult of the Infinitely Baffled"Hear The Bass, Not The Box The definitive online resource for Infinite Baffle subwoofer designEstablished 1999 - Home
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Old 15th November 2009, 10:24 AM   #5
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Cool idea but one small subjestion. I believe Lynn Olson subjested that when you mount 2 woffers like that you mount them with the magnets facing each other and
add a brace from magnet to magnet to cancel some unwanted vibration. I am not
positive it was Lynn Olson I read the article many years ago.
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Old 15th November 2009, 05:40 PM   #6
soho54 is offline soho54  United States
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Quote:
Using fireplace and chimney to mount IB subs?
This will not create an IB. You will end up with a sort of transmission line. Only the rear wave is thrown away, so it will have a very strange FR.
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Old 16th November 2009, 07:09 PM   #7
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Default Your answer

IB subwoofer FAQ page


scroll down to 19a
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Old 16th November 2009, 09:18 PM   #8
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Thanks for that info,

thats what I wanted to know. I guess its a no go for IB. I think I might just build a big ported box and hide it in the fireplace then. My main speakers are on either sides of the fireplace and my tv is on top of the mantel so its still a good place the sub.

Thanks everyone

Ant
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Old 27th November 2009, 09:36 PM   #9
wingman is offline wingman  Denmark
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Quote:
Originally Posted by Antonyhu View Post
Thanks for that info,

thats what I wanted to know. I guess its a no go for IB. I think I might just build a big ported box and hide it in the fireplace then. My main speakers are on either sides of the fireplace and my tv is on top of the mantel so its still a good place the sub.

Thanks everyone

Ant
It won't be a IB, but it will work as very large closed box.

"chimney sd" is 2787cm2 and AE IB15 830cm2 a piece total 1660cm2.

Do it, it will work fine!

uh, and I have an IB of my own
Wingman's IB
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Last edited by wingman; 27th November 2009 at 09:39 PM.
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Old 29th November 2009, 11:12 PM   #10
Collo is offline Collo  Australia
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There will be soot...
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