Hi All!
Most of the back wall in my home studio control room is a closet. It has 2 sliding mirror doors, floor to ceiling.
If I open one of the doors partially will it then become a Hemholtz Resonator (sort of)?
Also, I have read that glass is a good LF absorber, have you found this to be true?
What a great forum!!!!!
Thank you John L Sayers!!!!!
Aloha,
Stabb
Closet for Hemholtz?
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
-
John Sayers
- Site Admin
- Posts: 5462
- Joined: Mon Jan 27, 2003 12:46 pm
- Location: Australia
- Contact:
well yes - sort ofwill it then become a Hemholtz Resonator (sort of)?
when standing as sheets as in a studio window it will resonate but placed on your mirror doors it will do nothing to the lows except reflect themlso, I have read that glass is a good LF absorber, have you found this to be true?
cheers
john
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
John,
Sorry if the closet deal was a dumb thing.
Just me reaching and trying to make house friendly changes to make my control room viable.
My wife gives me nasty looks everytime I reach for my trusty cordless drill.
I've invested in Acoustic Sciences 'Mix Station' package but it just doesn't seem to be enough.
I'm trying to enlarge my listening sweet spot which is very small.
My bass just gets bigger and bigger the farther away I get from my console.
I bought two of Ethan's Minitraps and have ordered some OC 703 to build some of my own.
4" 703 was a special order so I ordered 2" FRK which, if I am not mistaken. had better specs than the other two options.
I am planning on doubling up the 2 inchers to get 4" (2'x4).
Then hanging them from the ceiling and walls.
For my sound room (another bedroom) I bought ASC's 'Quick Sound Field'.
That, I think works well but I'm planning to attach 1'x2' or 1"x3' pieces of 703 to like size plywood and hanging several pieces at angles all over the room.
Is this a waste of time?
I don't have the mental discipline to figure out the math.
Thanks for any advice.
Aloha,
Stabb
Sorry if the closet deal was a dumb thing.
Just me reaching and trying to make house friendly changes to make my control room viable.
My wife gives me nasty looks everytime I reach for my trusty cordless drill.
I've invested in Acoustic Sciences 'Mix Station' package but it just doesn't seem to be enough.
I'm trying to enlarge my listening sweet spot which is very small.
My bass just gets bigger and bigger the farther away I get from my console.
I bought two of Ethan's Minitraps and have ordered some OC 703 to build some of my own.
4" 703 was a special order so I ordered 2" FRK which, if I am not mistaken. had better specs than the other two options.
I am planning on doubling up the 2 inchers to get 4" (2'x4).
Then hanging them from the ceiling and walls.
For my sound room (another bedroom) I bought ASC's 'Quick Sound Field'.
That, I think works well but I'm planning to attach 1'x2' or 1"x3' pieces of 703 to like size plywood and hanging several pieces at angles all over the room.
Is this a waste of time?
I don't have the mental discipline to figure out the math.
Thanks for any advice.
Aloha,
Stabb
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
Hey, the closet thing works.
I shut the doors to my closet and played Eric Clapton's 'Change the World' which has lots of big bass notes.
As the track played I stood at the back of my control room and slowly opened on of the closet doors.
As the door opened wider, the low freqs in the back of the room died down.
I was pretty happy that I could hear the difference.
Still got other standing waves, though...
Aloha
I shut the doors to my closet and played Eric Clapton's 'Change the World' which has lots of big bass notes.
As the track played I stood at the back of my control room and slowly opened on of the closet doors.
As the door opened wider, the low freqs in the back of the room died down.
I was pretty happy that I could hear the difference.
Still got other standing waves, though...
Aloha
-
John Sayers
- Site Admin
- Posts: 5462
- Joined: Mon Jan 27, 2003 12:46 pm
- Location: Australia
- Contact:
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
-
John Sayers
- Site Admin
- Posts: 5462
- Joined: Mon Jan 27, 2003 12:46 pm
- Location: Australia
- Contact:
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
Yes!
Its funny because I have a chair that's very similar.
Except I forgot to include my desk and rack enclosures.
The desk is on my right with my computer monitor.
I just rec'd my fiberglass.
To get it to Hawaii I have to pay about $2 per sq ft.
I have to cook up another post to ask some questions about constructing hangers.
Aloha,
Stabb
Its funny because I have a chair that's very similar.
Except I forgot to include my desk and rack enclosures.
The desk is on my right with my computer monitor.
I just rec'd my fiberglass.
To get it to Hawaii I have to pay about $2 per sq ft.
I have to cook up another post to ask some questions about constructing hangers.
Aloha,
Stabb
-
illium
- Posts: 11
- Joined: Wed Sep 10, 2003 1:57 pm
- Location: st. louis, missouri, usa
out of curiousity, what is in the closet?
wouldn't it be neet to remove the existing clost doors, and build new doors out of vertical slats that would function as a much more effective resonator? if your closet is full of say... clothing on hangers, that would make a nice absorbative material so you could have one big bass trap made from your closet.. if you took the time to make your new doors air tight. you may even want to put some of that fiberglass raised off of the back of the closet doors..
i would say that now, what you're experience when you open the doors slightly is less likely to be due to a helmholtz resonating effect as you only have a single gap which is fairly shallow. that would only target a single frequency.. more likely what you're hearing is the difference between changing your acoustic boundry... by opening up the door, you let more air flow into the closet, and effectively lengthen the room.
i think. (:
_illium
wouldn't it be neet to remove the existing clost doors, and build new doors out of vertical slats that would function as a much more effective resonator? if your closet is full of say... clothing on hangers, that would make a nice absorbative material so you could have one big bass trap made from your closet.. if you took the time to make your new doors air tight. you may even want to put some of that fiberglass raised off of the back of the closet doors..
i would say that now, what you're experience when you open the doors slightly is less likely to be due to a helmholtz resonating effect as you only have a single gap which is fairly shallow. that would only target a single frequency.. more likely what you're hearing is the difference between changing your acoustic boundry... by opening up the door, you let more air flow into the closet, and effectively lengthen the room.
i think. (:
_illium
-
Stabb
- Posts: 15
- Joined: Sun Aug 10, 2003 5:41 am
- Location: Honolulu, Hawaii
illium,
i think, you may be right.
Sounds logical.
In the closet are guitars, tools, the boxes of gear that I've bought and other assorted junk.
My studio is part of my home and I love my storage space so sealing up my closet would only happen in a dream.
Whatever the case when I trying to hear things right, I slide both doors of my closet slightly open.
Interestingly, the glass doors vibrate with the sounds when the closet doors are shut but not when they are open.
As I come to understand acoustics, I hope someday to think about this and go, "Well of course! That's obvious!"
That's not happened yet, though.
Aloha,
Stabb
i think, you may be right.
Sounds logical.
In the closet are guitars, tools, the boxes of gear that I've bought and other assorted junk.
My studio is part of my home and I love my storage space so sealing up my closet would only happen in a dream.
Whatever the case when I trying to hear things right, I slide both doors of my closet slightly open.
Interestingly, the glass doors vibrate with the sounds when the closet doors are shut but not when they are open.
As I come to understand acoustics, I hope someday to think about this and go, "Well of course! That's obvious!"
That's not happened yet, though.
Aloha,
Stabb
-
illium
- Posts: 11
- Joined: Wed Sep 10, 2003 1:57 pm
- Location: st. louis, missouri, usa
stabb -
well i would say the reason that your doors vibrate when they are closed but not when they are open, is due to the 'sound/air pressure taking the path of least resistance' behvaiour... when the doors are closed, the sound pressure it exerted against the doors because there is no other path, and specifically, the doors are thinner and easier to move through than the walls themselves, so that will be the first place to absorb energy, thus the rattling. when you open up the doors a little, now there is a path for the air to follow to get into the closet, so it doesn't need to go through the doors... so the doors don't rattle.
i think i wasn't very clear about what i meant when i said 'seal the closet'.. i didn't mean close it up tight so you can't get to it, i meant put air tight seals (weather stripping) on the doors so that when the doors are closed, the closet is a sealed air space.. this shouldn't prevent your abiilty to open the doors or use the space.
i don't know how handy you are with wood construction techniques, but you could build new doors by making a 2x4 frame the size of the existing door, put slats vertically or horizontally across the frame, with appropriately sized air gaps, and make the doors the front face for a slat resonator. you could put some fiberglass on the back of the frame (or inside the frame would probably make more sense...) but not touching the wood slats... that would turn your entire closet into a big slat resonator, assuming those doors were weather stripped/sealed to make sure air is only able to get through the gaps between slats.
if this idea sounds at all like something you would want to do, i could make you a simple diagram showing how to construct it. this design wouldn't intrude on your existing closet space at all, but you would lose the mirrors. (: heck.. you could even get a glass cutting knife ($5 at any hardware store) and cut the mirrors up to face the slats on the door (glue em on..) and you would still have a mirror, sort of of.. just a mirror with a bunch of gaps in it, which was at one time a popular interior gesign element.
hope that helps...
_illium
well i would say the reason that your doors vibrate when they are closed but not when they are open, is due to the 'sound/air pressure taking the path of least resistance' behvaiour... when the doors are closed, the sound pressure it exerted against the doors because there is no other path, and specifically, the doors are thinner and easier to move through than the walls themselves, so that will be the first place to absorb energy, thus the rattling. when you open up the doors a little, now there is a path for the air to follow to get into the closet, so it doesn't need to go through the doors... so the doors don't rattle.
i think i wasn't very clear about what i meant when i said 'seal the closet'.. i didn't mean close it up tight so you can't get to it, i meant put air tight seals (weather stripping) on the doors so that when the doors are closed, the closet is a sealed air space.. this shouldn't prevent your abiilty to open the doors or use the space.
i don't know how handy you are with wood construction techniques, but you could build new doors by making a 2x4 frame the size of the existing door, put slats vertically or horizontally across the frame, with appropriately sized air gaps, and make the doors the front face for a slat resonator. you could put some fiberglass on the back of the frame (or inside the frame would probably make more sense...) but not touching the wood slats... that would turn your entire closet into a big slat resonator, assuming those doors were weather stripped/sealed to make sure air is only able to get through the gaps between slats.
if this idea sounds at all like something you would want to do, i could make you a simple diagram showing how to construct it. this design wouldn't intrude on your existing closet space at all, but you would lose the mirrors. (: heck.. you could even get a glass cutting knife ($5 at any hardware store) and cut the mirrors up to face the slats on the door (glue em on..) and you would still have a mirror, sort of of.. just a mirror with a bunch of gaps in it, which was at one time a popular interior gesign element.
hope that helps...
_illium