Can I I.B. ? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 11 Old 09-08-15, 10:57 PM Thread Starter
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Can I I.B. ?

I have a cement shelf that wraps my theater room. My dimensions are 16ft x 22ft x 10ft. The cement shelf 46" high and 18" deep. If I place a drop ceiling they will be 8ft. So from the shelf to the ceiling is approx. 4ft. If I build a baffle wall for my front speakers I can add another 18" from the cement wall. Im curious if I have the space to build an I.B. either behind my front baffle wall OR down the side walls. (keeping in mind if I use the side walls the speakers will be 46" or higher with a 18" depth). I could build a false wall on the right side against the concrete and use that space for an I.B.
My other option would be to use the side wall that leads into the basement using that open space for an I.B.
Its still a build in progress so now is the time to make the changes.
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post #2 of 11 Old 09-09-15, 01:15 PM Thread Starter
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Re: Can I I.B. ?

Uh-Oh No replies. Looks like an I.B. is NOT an option.
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post #3 of 11 Old 09-09-15, 02:25 PM
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Re: Can I I.B. ?

I have not played with IB setups as I haven't had any suitable spaces.
So a question: What is the volume of the space available for an IB setup and what drivers are you considering?

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post #4 of 11 Old 09-09-15, 04:28 PM Thread Starter
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Re: Can I I.B. ?

The drivers could be 12,15,18 no preference. The problem I am having is with the space itself. When I build the front baffle wall. I will have an closed area 16ft wide but only 18" deep up to the 46" cement shelf. Then it will open to 3 feet from the baffle wall to the back wall extending the additional 4 feet to the ceiling. If I build a false wall along the right side it would 18" deep X 48" high X 22 feet long. In not sure an I.B. will actually work since the space is so shallow. It's long but shallow. I was consider a line array type behind the front baffle wall. As far as the side wall, maybe 2 subs facing each other with a hole in the wall to port the sound.
Is my only concern the "volume" regardless of the shape and depth of the walls?
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post #5 of 11 Old 09-10-15, 12:49 AM
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Re: Can I I.B. ?

I am definitely no expert when it comes to IB, my understanding is that you want the largest area behind the driver you can manage so that it doesn't act like a box.
Having said that, the area you have available should be adequate to get some decent results and I don't think the depth is an issue as long as the driver is not near any side walls so that the sound pressure can spread evenly behind the driver.

If I'm wrong I hope someone else will pick me up on it.

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post #6 of 11 Old 09-11-15, 10:41 PM
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Re: Can I I.B. ?

It's all about the speaker you choose, you will need a minimum of 4 times the VAS rating of the speaker (for volume). But optimally 10. So find out which IB speaker you are interested in and use those specs to see if you have enough volume.
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post #7 of 11 Old 09-11-15, 10:42 PM
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Re: Can I I.B. ?

Oh yeah, this very forum has an excellent write up on IB's, their placement, requirements, etc: http://www.hometheatershack.com/foru...affle-faq.html
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post #8 of 11 Old 09-11-15, 11:42 PM
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Re: Can I I.B. ?

Quote:
dan77 wrote: View Post
Oh yeah, this very forum has an excellent write up on IB's, their placement, requirements, etc: http://www.hometheatershack.com/foru...affle-faq.html
Thanks for the link Dan77, as I said, I haven't pursued an IB setup for lack of space.
I am sure the OP will benefit from your guidance.

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post #9 of 11 Old 09-12-15, 07:34 PM Thread Starter
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Re: Can I I.B. ?

Quote:
dan77 wrote: View Post
Oh yeah, this very forum has an excellent write up on IB's, their placement, requirements, etc: http://www.hometheatershack.com/foru...affle-faq.html
Thank You.. I have some reading to do
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post #10 of 11 Old 09-17-15, 09:35 PM
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Re: Can I I.B. ?

Looks like you have a similar problem to mine... I wanted IB, and had to build a partition wall to enclose the back side. The total internal volume behind my wall is about 136 ft^3, so I followed the Vas *10 rule and selected drivers whose Vas was 1/40 that volume. (Using four drivers, 136 / 10 / 4 = 3.6) Fortunately for me, the drivers that most closely matched the specs I was after also happened to be a decent quality low-budget driver from PE. I'm still doing construction on this monster, so I'm a ways off from getting things all dialed in. Initial tests have gone extremely well though.

The bottom line is that even with fairly limited rear enclosure volume at your disposal, an IB setup is definitely not out of reach. Something to watch out for though: If you go the line-array route for the drivers, be prepared to brace the wall very heavily. All that mass moving in unison generates a lot of vibration in the structure to which it's mounted.
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