#1930197 - 04/21/08 01:05 PM
Building a recording Room
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AnalogAllstar84
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Registered: 09/20/07
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Hey fellow acoustic... ... ... fellows I suppose,
I was about to build a room suitable for recording drums and wanted to build it to the best of my ability with no standing waves. It is going to be a room within a room, like a big isolation booth, however, as I was running through the possible shapes, I've come to ideas. The big question however is how many degrees does a wall have to be to break up standing waves? I am assuming 5 degrees seeing as though my recording techniques book from college said that windows for a control room to the live room had to be at least 5 degrees... Would it sound better to build a room with two 90 degree angles and two 45 degree angles or build a rectangular room but then offset the walls using a 2X6 and a sheet of plywood...
[img]http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=12507865&albumID=2353192&imageID=33971022[/img]
Or here is the floor plan for the other idea... just the shape the size is yet to be determined...
http://viewmorepics.myspace.com/index.cf...mageID=33971048
Also if I do choose the shape instead of the offset wall design, how do i incorporate the ratios,
Height Width Length
1.00 1.14 1.39
1.00 1.28 1.54
1.00 1.60 2.33
Thanks
Brad
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#1930414 - 04/21/08 08:08 PM
Re: Building a recording Room
[Re: AnalogAllstar84]
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audiofreek
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Loc: Prince George,,CANADA
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It's Better to build a diamond shape(5 sides),it will have one 90 dergee angle, and fit nicely into a corner.As for room modes, all you can do, without getting very involved, is take average dimentions to predict room modes.I would copy an already existing design, if you can.Why re-invent the wheel?
A rough rule of thumb for minimum splay or off square is 1'in 15'.
Edited by audiofreek (04/21/08 08:14 PM)
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#1930461 - 04/21/08 10:49 PM
Re: Building a recording Room
[Re: audiofreek]
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AnalogAllstar84
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I'm assuming you're talking about something that looks like this,
http://www.vocalbooth.com/products/diamondseries.html
Thanks for the post though... it helps me out a lot.
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#1930620 - 04/22/08 08:03 AM
Re: Building a recording Room
[Re: AnalogAllstar84]
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Ethan Winer
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Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA
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how many degrees does a wall have to be to break up standing waves?
All rooms have standing waves whether the walls are angled or not. Angling walls in a recording room accomplishes only one thing - it avoids flutter echo between large areas of parallel reflecting surface. But that's not your main problem. The more important issue is avoiding comb filtering and reflections off the walls getting into the microphones. And for that you need absorption.
I can't see your drawing so I don't know how big your proposed room is. Unless it's very large (20 feet smallest dimension) you need absorption more than angled walls.
--Ethan
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#1930862 - 04/22/08 05:10 PM
Re: Building a recording Room
[Re: Ethan Winer]
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AnalogAllstar84
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Hmmm... I was under the impression that studios were built using no parallel walls to get rid of standing waves... So what you're saying then, in following up with the other information on the site... I could build a room that is
h= 12 feet
W= 13.68
L= 16.68
Which would result in 2738 cubic feet, and it would be more important for me to use absorption than to angle my walls?
Note room size is in line with the
Height Width Length
1.00 1.14 1.39
formula.
Thanks,
Brad
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#1931086 - 04/23/08 07:21 AM
Re: Building a recording Room
[Re: AnalogAllstar84]
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Ethan Winer
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Posts: 5227
Loc: New Milford, CT, USA
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Brad,
Yes, that's what I'm saying.
Also, there are studios and then there are studios. Someone with a million dollars or more to invest may hire a designer who chooses to angle the walls. There is some value in that. But in a home studio angling the walls almost always means you're making the room smaller than it could have been with straight walls.
--Ethan
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#1931419 - 04/23/08 06:29 PM
Re: Building a recording Room
[Re: Ethan Winer]
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AnalogAllstar84
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Huh... interesting... So it would then be better to make the room a tad larger but space the absorption further off the wall creating an air gap... Would it make any sense to use different size beams, for example put 6 inch air gaps close to the corner, then four inch heading towards the middle, two inches, then put the absorption straight to the wall directly in the middle? then have it flare back out as it gets closer to the corner?
I wish I had some way of posting these photos of the designs...
Thanks again Ethan, you've been a HUGE help as always! If there's ever anything I can help you with, let me know.
Brad
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#1931740 - 04/24/08 10:25 AM
Re: Building a recording Room
[Re: AnalogAllstar84]
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Ethan Winer
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Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA
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Brad, the best treatment is as thick as you can manage, versus thick here and thin there. You can get away with thinner panels at reflection points than in corners for bass trapping. But the goal is always to absorb to as low a frequency as possible.
--Ethan
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