Making a glass wall absorbant :S

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lizzie

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Hey, I'm enhancing my bedroom a bit for recording music en did some calculations. The golden section tells me I need to make one of my walls absorbant and also a foot of the surrounding walls. Now the point is, that particular wall, is almost entirely glass. It has 'lamellen' (don't know the english word) and curtains in front of it. Does it need more absorbing stuff? And can I put it between my 'lamellen' and my curtains? Or would this make no difference? I thought about hanging three absorbing panels between the 'lamellen' an dthe curtains.
Liz.
 
The golden section tells me I need to make one of my walls absorbant and also a foot of the surrounding walls.
What in the world is the "golden section", and how does it predict absorption needs( ie RT-60/room modes).

Now the point is, that particular wall, is almost entirely glass. It has 'lamellen' (don't know the english word) and curtains in front of it.
Describe lamelllen. Is it like a sheer fabric "light diffuser" curtain?

Does it need more absorbing stuff?

Well, that would depend on what your "golden section" predicts as absorption requirements in Sabines, vs the absorption coefficients of the materials used in your absorber panels. Also the room dimensions. It would also depend on whether this is a studio, control room or both. Its kind of like telling us your hungry, and a book tells you to eat watermellon, and you ask how much is enough :D

As to the glass wall, glass is highly reflective, although HEAVY curtains will absorb high frequency to an extent, depending on the weight, and how far from the glass it hangs, and how much area. There are other factors to consider too. In relationship to your monitors, is this a rear, side, or front wall?

Generally speaking, if this is a very small room, and you record in this room, you need all the absorption you can get, especially in corners. And since this will deaden the room acoustics, you will have to add ambience(reverb) in the mix. If this is only a control room, then treatment should be focused on the mixing environment, which translates into a symetrical monitoring position in relationship to the speakers, sidewalls, early reflections, and rear wall distance, just to name a few.
Of course, this is only my .02
fitZ
 
RICK FITZPATRICK said:
What in the world is the "golden section", and how does it predict absorption needs( ie RT-60/room modes).

AKA golden ratio, where the ratio of the short side to the long side equals the ratio of the long side to the sum of the sides:

x/y = y/(x+y)

or approximately 0.618034:1.
 
Hey I attached a simple drawing of my room, I do have a more detailed one, but I think that's only more hasle now. The glass wall is a side wall from the position where my monitors will be: against the wall with the door in it. I included a picture of lamellen: they are the yellow/green thingies in the windows. This is not my room, just some picture from the internet. The golden section is sort of explained already. The ratio is actually 1:1,6:2,6. There is about 15 cm between the lamellen and the curtains. I already made plans for where to put bass traps based on replies from other forum members. I now need absorption on that particular wall, any suggestion for particular material?
 

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I forgot some things, and my post just got deleted. The room is about 12 or 13 square meter. The lamellen are near the glass, but it totally depends on how you turn them. The golden section is something to with math, ancient greek people used to build acoustically perfect rooms or so. It has various other uses. And acoustics is not the main one.
Just what type of material should I just for constructing absorption panels? Again rigid fiberglass or something else?
 
yes, but in order to cancel reflection, you want some kind of absorption right?
 
Those would be called 'vertical blinds' in the US. I would leave them up, and put heavy curtains in front of them. That way you could still let in light when you wanted. If you like, you could increase the absorption somewhat by adding polyester batting (available at a sewing or crafts store) inside the curtains, essentially you would have quilted curtains.
 
Come on Rick, you know everything,
I should be so cursed. I just comment on what I think know regardless of what others know. Its my .02
AKA golden ratio,
Golden ratio does not equate with golden section to me. So maybe you enlightened me to something. I'm simply trying to enlighten lizzie to the possibility the a certain historical mathimatical ratio MAY not elicit the response in a room by virtue of its magical properties. Otherwise, EVERY studio that is designed from the ground up would be bound by way of this quasi scientific principle, REGARDLESS of limitations of what exists and the nature of the music business. Now, you want to get REAL? Tell me what recordings that YOU HEARD, were recorded in the last YEAR were recorded in a "golden section"? I mean, comon, the reality is THERE IS NO PERFECT ALL IN ONE DIFINITIVE room, PERIOD!!!!!!!!!!!!!!!!!!!!!!!!! You want to know why? Listen to your favorite recordings and it might give you a clue.
fitZ
 
never mind, go ahead with your own thing then. I'm not in the mood to explain. I do have a question: are you all gear sluts? And as for all the people that consider me newbie: I'm not american so some words of you don't sound familiar to me and the dictionary doesn't help. Fiberglass is literally translated in dutch: glasvezel, but that's something completely different. The dutch word for fiberglass is glaswol. So, if I don't completely understand you, it just might be because of this. And not because I'm a newbie 'screaming for help'
 
Lizzie, I'm not sure why it's important whether people here are "gear sluts" or not, or whether that was intended as a "put down" because you think someone is doing that to YOU, but that isn't the case - some of the people here get a bit "rowdy" from time to time, but normally mean no dis-respect.

I'm in contact with a Dutch acoustician on a fairly regular basis, and we've both had our share of "Terminology Confusion"; so if any terms used here aren't clear to you, please just ask. If I can't decipher it for you, I'm sure my friend can.

And if Rick sometimes irritates you, please remember it's not his fault; after all, he's Irish... :=)) (Sorry, Rick, couldn't resist :=)) Steve
 
lizzie said:
I do have a question: are you all gear sluts?

Not so much on this board. Many of us work in the 'industry', that is to say for this board, construction or acoustics. Although I just work in accountancy for a firm that does some acoustics work, so I have no formal acoustics training.

You'll find that the advice might tends towards proper construction techniques, but I always keep in mind practical considerations, especially budgets.

So while you might not end up with a perfect space, it will be a lot better than before you came, I hope.
 
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