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Will this space be okay for an IB setup ? (1 Viewer)

Joe Mihok

Second Unit
Joined
Dec 14, 2003
Messages
265
My wife an I recently bought a house (woohoo :)) and now I have the option of trying out this thing people call the "Infinity Baffle". I currently have a 15" Tempest in a ported 194 litre enclosure. While I am happy with the Tempest, it's huge and always an eyesore. Also, I'm always wanting to take on new projects and this one seems fairly inexpensive yet should offer good results. Anyways, the plan was to use a crawlspace located right beside my HT. I will take my Tempest driver out of the ported enclosure and use it for the IB. Later on down the road, I plan on buying another Tempest to run duals. Here are pics of the space:











The plan is to remove the flimsy door and screw on a sheet of MDF with the drivers and speaker mounted to it facing into the area. It will be done very similar to this:





I realize I won't be able to get into the crawlspace again unless I unscrew the MDF but I don't see that as a problem. So, do you think this space will work out ? And will it sound better than my current SBB4 194L Alignment ? And yes, I have a BFD and will flatten out the response.

Thanks for any input guys!
 

Joe Mihok

Second Unit
Joined
Dec 14, 2003
Messages
265
One should also note that the floor to the second level is located on the roof of the crawl space. if I wanted, I could easily make a small vent to join the two areas together. this would then make 1100 square feet of additional space for the enclosure. would this benefit the IB?
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
How many cubic feet are in the storage area?

That doesn't work. There would need to be a large opening to make 2 spaces function as one.

If the budget permits you should buy a pair of Avalanche 18"s at the closeout pricing.

www.ascendantaudio.com
 

Joe Mihok

Second Unit
Joined
Dec 14, 2003
Messages
265
The storage area is 152 cubic feet. And if I were to make a vent it would be as large as a regular furnace outlet. Sorry, money is VERY tight. I'm stuck with the Tempest for quite some time so I can't even look at the AV18's.
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
A vent that small is useless.

The opening between 2 adjacent spaces, needs to be as big as the wall dividing the spaces, for it to effectively add to the area of an IB.

You might want to wait until the budget allows multiple drivers with higher excursion before going with an IB.

A single Tempest mounted in an IB will not give you the same 'punch' as your existing sub.
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
Depends on the Vas of the drivers.

All this is explained in the FAQ section of the IB forum
 

Mattak

Stunt Coordinator
Joined
Dec 15, 2003
Messages
247
I don't see why you shouldn't try. You could make a new door out of 2 layers of mdf, mount the hinges and latch to it, and seal it with a strip of closed cell foam to test out the idea very easily. I say give it a shot!
 

Matt Bahnson

Auditioning
Joined
Apr 26, 2005
Messages
14
Joe,

An IB desgin has to be exactly that, an infinite baffle, in order to take full advantage of the design. This is a great idea, but take this into consideration: How many high end or even mid range subwoofers have you encountered that are made of 2x4's and dry wall? Your storage area was designed for storage, not extreme constant vibrations. I predict that you'll have a huge problem with sympathetic vibrations and possibly some serious whistling. Puting a sub in the area is a great idea, but I would build a really good sized box out of some solid 3/4" to 1" MDF and make sure to have a "face plate" or something of that nature that is exactly the size of the door...simply slide the whole box into the storage closet and mesh the "face plate" up with the door frame and you have the LOOK of a storage closet sub, without the sonic drawbacks.

Just and idea.

FYI, a 48" by 48" piece of 3/4" MDF is about $37 at Home Depot.
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
First by definition an infinite baffle is one where the baffle (not the space behind it) is infinitely large. Having that prevents the front and rear waves from canceling.

Second, the space behind the baffle does not need to be infinitely large. For optimal performance an area with a volume that's 10 times the sum of the driver's Vas, effectively functions as infinite space as far as a loudspeaker is concerned. But it's actually possible to use a space with a volume as small as 4 times Vas and get acceptable performance.

Building a 152 cu ft wooden box inside the space isn't necessary. Unlike 'portable' box subs where extraordinary means should be used because of the pressures involved, one can obtain extremely good sound quality with standard home wall construction.
 

HowY

Grip
Joined
Dec 3, 2004
Messages
17
What it seems everyone is saying is this
is effectively an enclosed cabinet and
I would agree, If indeed there can be
a large effective vent to a MUCH larger
space an IB may perform there.

an IB needs at least twice the volume
behind the driver (infinity) than the
volume of the space it's filling so
there is no pressure wave behind the
cone/driver - Love IB subs!

Read between the lines - work out the
VAs & Q's of the space you have and
build a sub out of that space, port
if needed make a nice sub area.

I personally would be quick to make
that space into rack - equipment
media space.
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
Nope it doesn't. As I said, 4 times Vas is minimum, and 10 times Vas or greater is optimal.

Those people doubting my recommendations, are welcome to checkout the link my signature for additional info regarding IB subs.
 

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