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I need some help with my strange 12 degree angled ceiling!
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Old 5th October 2012   #1
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I need some help with my strange 12 degree angled ceiling!

Hey everyone!

I'm having some difficulty deciding what method I want to go with to deal with my ceiling.

Here is an incredibly crude (sorry) drawing of my basic room shape.



I have thought of two possible methods:

1. Treat situation as normal and bass trap ceiling-wall corners disregarding height differences on sides.

2. Make some ceiling clouds that hang down from the ceiling and essentially create a rectangular-feeling room.

If I go with option 1, should I have my ceiling panels (with airgap) facing the angle of the ceiling, or should I have them parallel to the ground?

Any insight would be greatly appreciated!
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Old 5th October 2012   #2
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I know that conventional wisdom is to have the monitors on the short wall but in a room like this, you may want to consider trying them on the long wall of shorter height and a soffit along the top of the higher long wall.
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Old 5th October 2012   #3
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I know that conventional wisdom is to have the monitors on the short wall but in a room like this, you may want to consider trying them on the long wall of shorter height and a soffit along the top of the higher long wall.
I considered this but I don't feel like it would be worth it, not to mention it is incredibly inconvenient for my situation.

I didn't draw out the room in full detail, but in the back right corner there is an open diagonal archway that leads into the bathroom which would really mess up my ability to get rid of first reflections in that position. Also, I saw something very recently (I think on the RealTraps site) about a studio with slanted walls and a slanted ceiling to get rid of first reflections without absorption, and it was stated that the walls should be at least a 30 degree angle. So I would still be getting first reflections from the ceiling even if I set up against that wall.
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Old 6th October 2012   #4
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Unless you make a cloud, you will have ceiling reflections either way. Set up on the short wall, you probably need more attention to cloud design than on the lower long wall. The sharp wall/ceiling angle at the top of the high wall is bound to be trouble.
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Old 6th October 2012   #5
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Unless you make a cloud, you will have ceiling reflections either way. Set up on the short wall, you probably need more attention to cloud design than on the lower long wall. The sharp wall/ceiling angle at the top of the high wall is bound to be trouble.
I'm seriously considering the cloud option, it just seems to me like the best way. And the high ceiling corner isn't as sharp as I drew it. It's caused by the arched ceiling of the house, but the wall actually is a little bit past where it starts coming down again. So basically there are 2 corners fairly close to each other there. I just drew one corner for simplicity. Either way, I'm planning on bass trapping the living hell out of it haha
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Old 6th October 2012   #6
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If you effectively trap the first reflections off the ceiling via cloud your stereo imagine will likely be not as skewed. If the top right corner has an archway though, perhaps setting up on the opposite side would be best, as you will likely have low frequency asymmetry. Low frequency symmetry, IMO, is more important to get under control even before ER symmetry.
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Old 6th October 2012   #7
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If you effectively trap the first reflections off the ceiling via cloud your stereo imagine will likely be not as skewed. If the top right corner has an archway though, perhaps setting up on the opposite side would be best, as you will likely have low frequency asymmetry. Low frequency symmetry, IMO, is more important to get under control even before ER symmetry.
Thank you for the pointers! I am considering setting up on that wall depending on how my measurements turn out when I get my mic. I drew a sort-of to scale floorplan for reference. Would the archway act as sort of a low-frequency diffuser? Is it ok that only one side is pushed back?

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Old 6th October 2012   #8
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Would the archway act as sort of a low-frequency diffuser?
Think more in terms of each room connected as having it's own set of modal characteristics and an archway is a wide open path between them. Under the right circumstances, you can be in one room and hear the delay/reverb/"EQ" of an adjoining room. So I wouldn't say the arch would act as a diffuser in the typical sense.
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Old 7th October 2012   #9
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Think more in terms of each room connected as having it's own set of modal characteristics and an archway is a wide open path between them. Under the right circumstances, you can be in one room and hear the delay/reverb/"EQ" of an adjoining room. So I wouldn't say the arch would act as a diffuser in the typical sense.
Not as a high-frequency diffuser, I meant as a low-frequency diffuser. I would think it would mainly act as a diffuser for the sub-bass region because it is a difference in depth of ~4 feet from the main back-wall. Its high-frequency characteristics I would perceive to be undesirable, so I plan on putting some sort of absorber there to take care of it.
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Old 10th October 2012   #10
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I guess I have trouble thinking of an arch as a diffuser, because it is one portal into the room. If you had an array of arches with different volumes behind, perhaps, but unless the space beyond the arch had the right characteristics, I don't see it bringing diffusion as much as resonance, delay, phase cancellation and reinforcement, etc., more indicative of the volume and dimensions of the room beyond the arch as a whole. I think of a diffuser as having numerous chamber volumes and phase offsets for those volumes.
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Old 11th October 2012   #11
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I guess I have trouble thinking of an arch as a diffuser, because it is one portal into the room. If you had an array of arches with different volumes behind, perhaps, but unless the space beyond the arch had the right characteristics, I don't see it bringing diffusion as much as resonance, delay, phase cancellation and reinforcement, etc., more indicative of the volume and dimensions of the room beyond the arch as a whole. I think of a diffuser as having numerous chamber volumes and phase offsets for those volumes.
You're most likely right with this because the archway leads to an entirely different room. The only reason I had the idea was because of this video:



Go to about 5:30 and you'll see what I'm talking about.
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