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Post by gouge on Sept 4, 2019 16:13:31 GMT -6
john in response to your statement that helmholz resonators arent diffusers.
taken from handbook of acoustics......
"The sound impinging on a Helmholtz resonator that is not absorbed is reradiated. As the sound is reradiated from the resonator opening, it tends to be radiated in a hemisphere. This means that unabsorbed energy is diffused, and diffusion of sound is a very desirable thing in a studio or listening room."
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Post by johneppstein on Sept 4, 2019 17:15:16 GMT -6
I didn't say I liked the polycylindrical diffusor, I said it was the only real diffusor I saw on that page. I also said that don't think much of poly diffusors. Or other one-dimesional diffusor types. I said I like hemispheric "skyline" style diffusors and the custom 2 dimensional diffusors I've seen on the walls of major studios.
I've never been to Electrical Audio, but don't they do a fair amount of work with groups on a tight budget that probably can't afford a large room?
Studio B at Electrical is huge. Center Field room in Studio A is also large. I think a big thing with that spot is that bands with a tight budget can access a super high quality recording studio without exhausting their life savings. (sorry for going off topic) As I said I have not been there, but Gouge was referring to it as a place with a lot of little rooms. The only contact I've had with it was that one of their techs sent me some badly needed tech info I hadn't been able to find elsewhere, which was very nice.
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Post by johneppstein on Sept 4, 2019 17:18:18 GMT -6
john in response to your statement that helmholz resonators arent diffusers. taken from handbook of acoustics...... "The sound impinging on a Helmholtz resonator that is not absorbed is reradiated. As the sound is reradiated from the resonator opening, it tends to be radiated in a hemisphere. This means that unabsorbed energy is diffused, and diffusion of sound is a very desirable thing in a studio or listening room." That doesn't make it an actual diffusor, which is why they don't call it one.
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Post by gouge on Sept 4, 2019 18:15:50 GMT -6
lol. by the way here is an example of a "WIDE BAND" perforated diffuser. Attachments:
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Post by Omicron9 on Oct 24, 2019 8:47:25 GMT -6
Fascinating options and reading material. Part of me is more confused than ever, but still digging learning about diffusion and absorption. Thanks, everyone! Regards, -09 to answer your first question. diffuser/absorber is really the only way to go in the average sized small control room. Thanks, gouge. To clarify: this is for a tracking room, not a control room. How might that impact my needs? Room is about 18x19 ft, 8 ft ceiling. Not perfectly rectangular, as one wall has a 2-ft jog. Regards, -09
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Post by gouge on Oct 28, 2019 0:34:10 GMT -6
so a double garage space.
for tracking you can get away with surprising little acoustic treatment as long as you dont put mics within 4-5ft of walls or if you do ise the null.
is the room sealed?
at a minimum id bass trap the corners. the issue forcyou os the ceiling height. id focus there.
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Post by Omicron9 on Oct 28, 2019 7:34:20 GMT -6
so a double garage space. for tracking you can get away with surprising little acoustic treatment as long as you dont put mics within 4-5ft of walls or if you do ise the null. is the room sealed? at a minimum id bass trap the corners. the issue forcyou os the ceiling height. id focus there. The room is sealed, yes.
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Post by matt@IAA on Oct 28, 2019 11:41:09 GMT -6
A Helmholtz resonator has to have a sealed cavity to work. I believe you can use an unsealed, perforated panel to act as a filter in front of absorbing materials. The holes in these panels will act as a diffuser and a frequency dependent reflector. The response is based on the size, pattern, and spacing of the holes, as well as the degree of perforation (is how much absorbent material is exposed vs reflective surface area). The absorbing behavior depends on the usual characteristics - material, thickness, air gap, etc.
Just my .02.
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Post by Tbone81 on Oct 28, 2019 12:29:47 GMT -6
so a double garage space. for tracking you can get away with surprising little acoustic treatment as long as you dont put mics within 4-5ft of walls or if you do ise the null. is the room sealed? at a minimum id bass trap the corners. the issue forcyou os the ceiling height. id focus there. Not disagreeing with you here but thought I'd share something from personal experience. Without proper acoustic treatment you can get weird comp filtering in different locations of your tracking room even though the ambience and general "sound" of the room may seem good with minimal treatment.
To the OP: IMHO its best to start with a rough plan of how and where you'll put up your absorption and diffusion. BUT, be flexible and go slow. Make one change at a time and then listen to how it sounds because more than likely you'll be altering your original plans to get the best sound. That goes for both CR and Tracking Room.
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Post by gouge on Oct 29, 2019 16:04:33 GMT -6
so a double garage space. for tracking you can get away with surprising little acoustic treatment as long as you dont put mics within 4-5ft of walls or if you do ise the null. is the room sealed? at a minimum id bass trap the corners. the issue forcyou os the ceiling height. id focus there. Not disagreeing with you here but thought I'd share something from personal experience. Without proper acoustic treatment you can get weird comp filtering in different locations of your tracking room even though the ambience and general "sound" of the room may seem good with minimal treatment.
To the OP: IMHO its best to start with a rough plan of how and where you'll put up your absorption and diffusion. BUT, be flexible and go slow. Make one change at a time and then listen to how it sounds because more than likely you'll be altering your original plans to get the best sound. That goes for both CR and Tracking Room.
[br i dont disagree elevtrical audio as an example again the tracking rooms there have very different treatments. to be honest for really loud guitars i do prefer highly absorptive but for acoustic instruments more ambiance. it all depends really. that said, 8ft ceilings are very problamatic. 10ft is so much better regardless of wall treatment.
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Post by yotonic on Oct 29, 2019 23:35:05 GMT -6
In the "venue business" very few places can afford real diffusors, as John said they are incredibly expensive and have to be built geometry-wise specifically for your space. They are lovely and functional but seem to fall more in the domain of high-end theaters and big dollar installations where they are part of the initial build out and architectural planning. I would love some of these rolling diffusors from Skywalker sound. Attachments:
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