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Old 21st May 2014, 05:03 PM   #1
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Default SS18 against ceiling question

I need someone with more knowledge about sub coupling than I have to help me with a placement question. I'm trying to help a church add subs to their 400 seat auditorium. The below drawing shows what I intend to do. Two of Jbell's SS18's will fit perfectly against the ceiling on either side of the 1' by 5' wooden beam that runs the entire length of the room. It's 20 feet from the bottom of the beam to the floor and about 30 feet from the back wall of the stage. There is a small speaker cluster below the beam at this point. Will the subs couple effectively? There are no corners available in the room and all the walls have aisles at floor level.

Sorry about my poor sketchup drawing.

Thanks,
Steve
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Old 21st May 2014, 05:40 PM   #2
sine143 is offline sine143  United States
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the biggest question is.... how are you going to hang them....
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Old 21st May 2014, 05:47 PM   #3
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Originally Posted by sine143 View Post
the biggest question is.... how are you going to hang them....
Luckily the church has a member who is a structural engineer and is more than willing to help.
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Old 21st May 2014, 08:45 PM   #4
epa is offline epa  Netherlands
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many years ago i designed this rear loaded horn for this type ceiling.
its designed so the mouth is extended in the roof.

Click the image to open in full size.
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Old 21st May 2014, 09:16 PM   #5
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Originally Posted by epa View Post
many years ago i designed this rear loaded horn for this type ceiling.
its designed so the mouth is extended in the roof.
That's a neat design and would work if not for the huge beam in the middle of the roof.
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Old 21st May 2014, 09:37 PM   #6
epa is offline epa  Netherlands
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its just an idee .
you got so much space,why not design something especial for that ceiling.
edit/
aha now its becomes clear.the orange thingys are the subs.
that wil work,mouth pointing away from "stage"
the subs wil bennefit from the ceiling
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Last edited by epa; 21st May 2014 at 09:46 PM.
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Old 21st May 2014, 09:50 PM   #7
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Originally Posted by epa View Post
its just an idee .
you got so much space,why not design something especial for that ceiling.
edit/
aha now its becomes clear.the orange thingys are the subs.
that wil work,mouth pointing away from "stage"
Sorry my drawing is not very clear. Actually the SS18 at 19 inches wide is a perfect fit for the 19 inch wide joist that is connected to the monster beam. With a light varnish it will disappear against the ceiling.

Steve
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Old 22nd May 2014, 09:28 PM   #8
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I'd suggest something that digs quite a bit deeper for pipe organ type stuff. Unless this is just for PA some music etc.

If you're limited on width I'd go with a long tapped pipe or something similar. Bjorno can chime in and help....
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Old 22nd May 2014, 10:55 PM   #9
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Originally Posted by m R g S r View Post
I'd suggest something that digs quite a bit deeper for pipe organ type stuff. Unless this is just for PA some music etc.

If you're limited on width I'd go with a long tapped pipe or something similar. Bjorno can chime in and help....
Totally different system. This is just an add on to a church's music system. The church with the pipe organ system is on hold for the moment. That's why I started a new thread.

I just need to know if the subs will couple at all with that big beam between them.

Steve
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Old 23rd May 2014, 03:02 AM   #10
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Originally Posted by Old Ears View Post
I just need to know if the subs will couple at all with that big beam between them.
Steve,

Even at the upper end of the pass band, the "big beam" is relatively small compared to the wavelengths reproduced, the subs will couple just fine.

Art
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