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
Sorry about my poor sketchup drawing.
Thanks,
Steve
Attachments
Luckily the church has a member who is a structural engineer and is more than willing to 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
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
My review of using SS18s
After building and using Jbell's SS18s with the Dayton 18", I wanted to do a short followup. The described location turned out better than anticipated. There was actually a small attic in back of the wall so the subs are hidden and the only thing seen are two white grills. After mixing on them for a couple months I'm in love with the tapped horn sound. They are more than adequate for the 400 seat auditorium at the levels we use. The low end is tight with none of the "mushy" BR sound. I have them high passed at 30Hz and crossover at 80Hz. They could go higher but in this system sound best crossed at 80Hz. Since these were hidden I built them out of MDF with extra bracing. The build is stupidly easy and they literally cost less than $100 each.
I would like to thank James Bell for a wonderful design and for his willingness to share.
After building and using Jbell's SS18s with the Dayton 18", I wanted to do a short followup. The described location turned out better than anticipated. There was actually a small attic in back of the wall so the subs are hidden and the only thing seen are two white grills. After mixing on them for a couple months I'm in love with the tapped horn sound. They are more than adequate for the 400 seat auditorium at the levels we use. The low end is tight with none of the "mushy" BR sound. I have them high passed at 30Hz and crossover at 80Hz. They could go higher but in this system sound best crossed at 80Hz. Since these were hidden I built them out of MDF with extra bracing. The build is stupidly easy and they literally cost less than $100 each.
I would like to thank James Bell for a wonderful design and for his willingness to share.
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