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02-14-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,159
Joined on 05-28-2004
Post #: 1
Post ID: 12933
Reply to: 12933
Reflections pattern in Cathedral Ceiling listening room.
fiogf49gjkf0d

I wonder, do cathedral ceilings has any acoustic focusing effects?

Theoretically the vertical reflections shall bubble themselves up but in practically I have no knowledge how the Cathedral Rooms behave. Did anybody try to analyze how Cathedral Ceiling behave acoustically and then to cancel the influence of the Cathedral Ceiling with false ceiling? If anybody know any data on the subject of have own experiments done then, please, share.

I get a feeling that in larger Cathedral Ceiling room my principle of using HF sails still will be very beneficial but at this point is just a guess…

The Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-14-2010 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,658
Joined on 10-12-2006
Post #: 2
Post ID: 12938
Reply to: 12933
Purely Subjective Data
fiogf49gjkf0d
As one might suspect, the vaulted ceilings eat and augment the sound in totally unpredictable ways.  Hard to say if sails would help or they might eat the wrong frequencies.  I would start by trying to get the room as hyped up as I could and then start backing off on the elements I perceived as "too much".  I dealt with this two houses ago, and I never padded or "treated" a big wall that was totally covered by a mirror, just because I wound up needing that big hard surface to keep the energy going in the listening area.  I think I mentioned back a ways that the best energy in my present listening room is very near the first reflection point on the ceiling, about 2 feet away from it and 2 feet below the damned ceiling!  Vaulted ceilings can help with a kind of "soundstage" portrayal, but they can be quite the bitch to really load usefully.

Best regards,
Paul S
02-14-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,159
Joined on 05-28-2004
Post #: 3
Post ID: 12939
Reply to: 12933
My version of Cathedral Ceiling Sail.
fiogf49gjkf0d

CathedralCeilingSail_1.jpg

CathedralCeilingSail_2.jpg

CathedralCeilingSail_3.jpg

CathedralCeilingSail_4.jpg



"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-15-2010 Post does not mapped to Knowledge Tree
tuga


Posts 174
Joined on 12-26-2007
Post #: 4
Post ID: 12943
Reply to: 12933
Reflections
fiogf49gjkf0d
Hi Romy,

From a geometry perspective, having a two planes in the ceiling will increase reflections and whether these reflections will target the listener area higher or lower in the Z (vertical plane) depends on their angle.
Instinct tells me that you should add a several transversal ribs to to the vaulted surfaces for diffraction.

Cheers,
R

"Science draws the wave, poetry fills it with water" Teixeira Pascoaes
02-16-2010 Post does not mapped to Knowledge Tree
el`Ol
Posts 225
Joined on 10-13-2007
Post #: 5
Post ID: 12952
Reply to: 12943
Fractal rooms
fiogf49gjkf0d
The vaults of palace room in the islamic world make them very useful as music performing rooms. But they are kind of a "fractal" version of a gothic cathedral that works over a broad frequency range.
02-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,159
Joined on 05-28-2004
Post #: 6
Post ID: 12958
Reply to: 12952
Cathedral Ceiling Ledge
fiogf49gjkf0d
Among many exiting features of the room that I have in my target there is one that among others features made me to live the room from the first sight.   The Cathedral Ceiling has a very interesting ledge at the perimeter of ceiling. When they built 17 years back they did it juts for architectural fan as it serve no purpose. Well, they hide lighting fixtures on the Ledge that beam at the top of the ceiling but invisible from ground. This itself is nice but from acoustic perspective I think this ledge is a phenomenal tool. If how I think is the way how it will work then loading the ledge with absorber/defuses would allow mitigating the amount of HF nose I will be picking from the ceiling. The most wonderful thing that by doing it I will be able to hide the acoustic treatment at the Ledge and do not ruin a living room by with audio installation efforts. I am not sure if it works properly but it was very much in my mind what I first saw the room…

CathedralCeilingLedge.JPG

The Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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