Advice needed for manifold design in tight place - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com
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post #11 of 23 Old 11-27-12, 02:48 AM Thread Starter
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Re: Advice needed for manifold design in tight place

Here are some Google sketches of what I was thinking about during post 1. The round tubes are the port for a LLT if I decide to go that way and the rectangle "tubes" are the A/C vent or how I can modify it.

Option1
https://www.dropbox.com/s/fo5qrnsjij...Option%201.skp

Option2
https://www.dropbox.com/s/wdr9agkthe...Option%202.skp

Option3
https://www.dropbox.com/s/rxz8ivq14a...Option%203.skp
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post #12 of 23 Old 11-27-12, 03:50 AM
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Re: Advice needed for manifold design in tight place

I'm unable to view your pics.




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post #13 of 23 Old 11-27-12, 10:07 PM Thread Starter
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Re: Advice needed for manifold design in tight place

Uploaded as JPEGS now. The round tubes are the possible ports and the rectangle "tubes" are the A/C ducts.

Option 1


Option 2


Option 3
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post #14 of 23 Old 11-27-12, 10:19 PM
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Re: Advice needed for manifold design in tight place

Option 1 would require you knowing exactly how big the enclosure is. Not sure about option 2. Option 3 is a a lot of tin rattling. How many cu.ft. is the back space?




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post #15 of 23 Old 11-28-12, 07:43 AM Thread Starter
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Re: Advice needed for manifold design in tight place

I have been up there a couple of times and 70-90 cubic feet is a good estimate for the space outside the original roof and encased in the new roof. I would of course do measuring to get that more accurate. The duct work is currently a flexible soft duct so I would not worry about the rattling. I am more concerned about having the duct so close as to loose output into it. If that makes sense.
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post #16 of 23 Old 11-28-12, 10:28 AM
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Re: Advice needed for manifold design in tight place

Mike, for Option 1 and 2, (well, for all three) do you need to make sure the manifold opening area is > or = to the Sd of all the drivers?
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post #17 of 23 Old 11-28-12, 02:05 PM
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Re: Advice needed for manifold design in tight place

Ideally yes, it can be a bit smaller from IB installs I have seen.


Quote:
I am more concerned about having the duct so close as to loose output into it.


Option 3 is a first that I've seen, I can't say what the result would be.





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post #18 of 23 Old 11-28-12, 02:29 PM
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Re: Advice needed for manifold design in tight place

It seems with any of the three options you would be losing output to the ventilation unless it was routed through a rigid, inert conduit and sealed off from the enclosure space. The drivers would be pressurizing the space, and gottavtr noted he was using flexible soft ducting, which would easily deflect even more than regular ducting.

IMO the best thing to do would be to isolate the ducting (it sounds like the space isn't very big, so it shouldn't be very difficult) inside the enclosure using MDF or whatever to create a protective "shell" around the ductwork.

What about something like this to solve the porting issue:
Advice needed for manifold design in tight place-capture.png
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post #19 of 23 Old 11-28-12, 03:00 PM
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Re: Advice needed for manifold design in tight place

Just for fun I modeled 4 Mach 5 IXL 18.2.2's in 90 cu.ft tuned to 10 hz and powered by a single EP4000 amp. Output would be 120 db down to 10 hz. That would be awesome. To bad the only place you can get the drivers is in Australia since there not available in North America.




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post #20 of 23 Old 11-28-12, 07:08 PM
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Re: Advice needed for manifold design in tight place

Now that I see your pics I understand what you mean by Port and it looks to be quite too small but should be an easy cure. As far as your duct goes if you could isolate it would probly give you more output from the subs.
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