treat a transparent glass panel ceiling

How to treat the glass panel ceiling zone ? Before you read the following text, notice that you can download the same with 3d images and plans ( attached PDF from the download button, down the page ) . . ........................................ 1- The room : Size: 18 / 14.4 / 7.7 ft ( 550 / 440 / 237. cm ) It’s a basement , concrete & brick walls, with 2 thick glass panels above. Day light comes down from the ceiling, a precious feature for comfort. A first basic job was done in there to chase humidity and offer decent sound proof . Floating concrete floor/ rockWool—plaster panel walls, strong ventilation . A “box-in-a-box”. If we take the room size in account, according to most advises, the best mix position would be right under one of the glass panels. and that is... 2- The problem The ceiling above the mixing position is critical area, where some frequencies have to be absorbed, and others diffused.... A flat transparent plexi or glass panel would not be much of a diffusor, and absorb my .... 3- A solution : I imagined a transparent plexiglass Shroeder diffusor . The shroeder diffusor is quite easy to design an built, as you find precise dimensions on this web site: http://www.mhsoft.nl/diffusor2.asp#calcul 4- My question is: Is it a viable solution. If yes, what would be the type of calculation/ measurement to do to determine the size/ frequency range to cover in diffusion. .................................................... Thank you for reading this . Any of your answers would be usefull, and a cool welcome for me, as this is my very first post here. I feel this forum/site is THE place, about listening "gourmets" ! (I'm french, that's why my ... accent!) [/url]

i think RPG sells a plexiglass diffuser that may be easier and just as cost effective. http://www.rpginc.com/products/omniffusor/index.htm

Thank you. I now have to think about what to do for the rest of the ceiling. (non transparent areas.) I guess the action of a diffuser should be alternated by absorbers around, and the big question now is: Simple MF-HF "cloud" absorbers, or deeper freq range helmoltz broadrange slat reso ??? ........................... That's another discution, I know, so let me make quick tour around the forum to see where that could be discused, hoping to find you there and benefit from your precious help . Cheers

2 thick glass panels above. Day light comes down from the ceiling,

You have a sky light. What is the size of this sky light? Or maybe a picture is available?

nyves - from your pdf file it looks like the glass ceiling is well behind you and therefore shouldn't be a problem provided the rear of the room is absorption thus stopping any returns from the rear. Placing a diffusor above your listening position WOULD be a problem IMO as the scattering of reflected frequencies would cloud your imaging.

He has two lights overhead John. One is directly over the monitoring position. Is that a lot of glass or no?

Thanks Brien - I missed it. As I said a diffusor would add additional problems - I'd angle a sheet of 3/8" or 1/2" glass or perspex over the console and under the skylight - that would allow the light through but stop the vertical reflections from it. cheers john

thank you John. A simple flat glass panel with an angle, ok. And I just thought, when some absorpsion is needed over head, i could alway create a removable soft panel (fixed with magnets, or rolled asside on curtain rods...i'll find a way, fiberglass is light weight.) only when better sound definition is more needed than light , and when comes the night ! Knowing that front wall will have basstrap under soffits + mids & highs absorptions, LEDE like, what would you choose as an angle for that glass panel ? (A or B, on the picture)

version B is what I had in mind.

Cool, the question now have an answer ! ... time for me to download "Sketchup", now, and start a clean design for eventual future post. (right now, I try to sketch on Maya", witch is like using a bulldozer to cut the grass..) Encore merci. A bientôt.