Advice needed for manifold design in tight place - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 23 Old 11-25-12, 10:01 PM Thread Starter
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Advice needed for manifold design in tight place

Hello,
I am planning our new subwoofer for the new house. I have not decided on a LLT or infinite baffle but this thread is limited to the manifold design. I also have not decided on the drivers. I may either use the two Titanic 12's in my closet or purchase 4-8 Mach 5 IXL 18.4's. It just depends on what manifold design is feasible. Our living room only has a small section of wall linking it to the attic. This wall is triangle shaped due to the vaulted ceiling. The width is about 16 feet with a height of about 3.5 feet. Add to this that the room is an add on with the original roof being perpendicular to the living room this makes it a very tight fit. The only A/C vent is also on this wall. We also do not want to cut the paneling without making it look original.

Therefore I plan to combine the two existing ducts to one one side and install a larger register. On the other side I will install another matching register with a manifold behind it. Everything seems viable until the port comes into the design.

Option 1:
Port extends from the "box" through the back wall of the manifold and to the surface of the wall. I do not see how I can make the opening large enough to give the drivers enough free air and house the port tube. What is the standard thinking of how much breathing room to give the front of the drivers without tuning the front wave like a bandpass box?

Option 2:
Like above but have the port opening terminate on the back wall of the manifold. Will having the port opening share the manifold give a problem with tuning?

Option 3:
I may need to build wider more shallow manifold. To do this I would need to have the A/C duct terminate on the back wall of the manifold. Would placing such a significant "pressure leak" inside the manifold lower the output?

Thanks for any help.
Zach
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post #2 of 23 Old 11-26-12, 08:19 AM Thread Starter
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Re: Advice needed for manifold design in tight place

Here is a picture from opposite side of the room.

http://i196.photobucket.com/albums/a...g?t=1353939216

Last edited by gottavtr; 11-26-12 at 08:34 AM.
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post #3 of 23 Old 11-26-12, 08:42 AM
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Re: Advice needed for manifold design in tight place

Your pic isn't showing up, and I'm having a bit of trouble visualizing your layout and your proposed ideas; could you post a sketch of what you're thinking?
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post #4 of 23 Old 11-26-12, 08:47 AM
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Re: Advice needed for manifold design in tight place

Link to pic fixed.

Option 1 and 2 would require a manifold big enough for the driver's total Sd and the port. Option 3 will result in a lot of tin rattling.




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post #5 of 23 Old 11-26-12, 01:18 PM
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Re: Advice needed for manifold design in tight place

Mike, do I just not know how to click a link, or is there something wrong with the pic link still that just takes you to photobucket???
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post #6 of 23 Old 11-26-12, 01:38 PM
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Re: Advice needed for manifold design in tight place

The link works for me, this is the image:

Advice needed for manifold design in tight place-frame..jpg




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post #7 of 23 Old 11-26-12, 01:52 PM
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Re: Advice needed for manifold design in tight place

Weird... here is where it takes me.
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post #8 of 23 Old 11-26-12, 02:20 PM
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Re: Advice needed for manifold design in tight place

Strange, your link goes to Photobucket main page, his link goes to the pic. I'm not sure what to tell you.

Try this:

http://i196.photobucket.com/albums/a...g?t=1353939216




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post #9 of 23 Old 11-26-12, 04:35 PM
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Re: Advice needed for manifold design in tight place

I give up; it's probably the computer I'm on. You posted the picture anyways, thanks! I'm interested to see which option gottavtr wants to go with.

It seems like not messing with ports would be easier and to just go with IB, but I am not well versed in IB requirements.
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post #10 of 23 Old 11-26-12, 06:19 PM
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Re: Advice needed for manifold design in tight place

Just a blunt reply: But what do you mean by port? The only one of your option's i'd worry about is #3 but that could be cured with rubberized undercoating or some other sound deadener and sealing it off but that can get spendy$$$. FI also makes some awesome IB's.
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