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Acoustic Question...
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psychowave
IsraTrance Full Member
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52
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217
Posted : Oct 2, 2007 21:11
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On 2007-10-02 17:26, fuzzikitten wrote:
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On 2007-10-02 14:06, psychowave wrote:
Any here can suggest a material type to make a bass trap?
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Just get some insulation from a hardware store and stuff it in to a garbage bag. Then cover the garbage bag with something soft (old carpet or clothes). Not too fancy, but RJ-45 insulation works well for bass.
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Nice...thanks man..but I don´t understand one think...
What is RJ-45 insulation? Here in Brazil RJ-45 is a kind of cable..Ethernet Cable...is right?
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Dharma Lab
Started Topics :
8
Posts :
342
Posted : Oct 3, 2007 04:07
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I think he meant R-45. R value is an insulators resistance to conduction heat. With traditional insulation, the thicker the insulator, the better the R value. With fiberglass insulation, air can flow thru it.
When you get into other types of insulators, airflow may be addressed, so it sounds like we want decent air flow, and a good thickness, hence the R-45 fiberglass insulatoin suggestion.
 Keep The Faith,
Christian K. |
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fuzzikitten
Annunaki
Started Topics :
40
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603
Posted : Oct 3, 2007 04:44
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On 2007-10-02 19:59, subconsciousmind wrote:
(permeable to air, since sound travels through air) |
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and through water, brick, human bodies, and any other system capable of transferring the vibrational energy.
I don't remember about the basstraps I saw, it was in an article online.
I don't know nothing about this stuff anyways, just put insulation in corners eat bass frequencies ok write more music. garbage bags were just to keep from breathing fiberglass dust.
Yeah, R-45, that's what I meant. Thick insulation. More thick = more better.
I've got a couch. I turned it on it's end and shoved it one corner. Put the pillows in another corner.
*shrug*
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subconsciousmind
SCM
Started Topics :
37
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1033
Posted : Oct 3, 2007 08:39
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On 2007-10-03 04:44, fuzzikitten wrote:
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On 2007-10-02 19:59, subconsciousmind wrote:
(permeable to air, since sound travels through air) |
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and through water, brick, human bodies, and any other system capable of transferring the vibrational energy.
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Humm.. Yes, you are of course right. My statement wasn't very smart.
This now brings us closer to the point of understanding your invention I guess
For example brick is not a very good tranductor to sound, so most of the energy will be reflected. The trick is to have something which is a good transductor so the sound energy will not be reflected and goes inside the material where it will be slowed down... I imagine a waterwall, magically, vertically holding could be good too
When it comes to your garbagebag invention I believe you notice some effect because certainly the bag (especially the stuff on it) is not an as good reflector as the wall. And because you have an obstacle in the critical corners. Just the shap of a corner is paradise for bass emphasis, since you break with that, it will help.
But, if you hadn't put the insulation (I believe that fibre stuff is permeable to air) into the air sealed garbage bag you would have an additional stronger effect.
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I don't remember about the basstraps I saw, it was in an article online.
I don't know nothing about this stuff anyways, just put insulation in corners eat bass frequencies ok write more music. garbage bags were just to keep from breathing fiberglass dust.
Yeah, R-45, that's what I meant. Thick insulation. More thick = more better.
I've got a couch. I turned it on it's end and shoved it one corner. Put the pillows in another corner.
*shrug*
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thats certainly helping. Every obstacle in the room, especially in the corners difuses reflections. So I believe your intuition serves you well.
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fuzzikitten
Annunaki
Started Topics :
40
Posts :
603
Posted : Oct 3, 2007 13:54
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On 2007-10-03 08:39, subconsciousmind wrote:
But, if you hadn't put the insulation (I believe that fibre stuff is permeable to air) into the air sealed garbage bag you would have an additional stronger effect.
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Yeah, I think you are correct there. Makes sense. Next time I'm doing soundproofing with insulation I'll have to find some air-permeable container to hold the insulation in rather than a trash bag. |
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psychowave
IsraTrance Full Member
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52
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217
Posted : Oct 3, 2007 15:22
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Nice guys!
By this...I will forget the garbage bags, and search a kind of air-permeable material like a cloth...
I´m searching now for a rockwool...
Firstly I will put the bass traps just on back wall corners...and after I explain to other walls...When I get all material I post pics here of making process...
Thanks agains for all!
Natan
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Get-a-fix
Getafix
Started Topics :
147
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1441
Posted : Oct 3, 2007 16:07
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subconsciousmind
SCM
Started Topics :
37
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1033
Posted : Oct 3, 2007 18:01
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Now thats a really cool Idea!
Be aware the so called "super sub bass bags" are only 15cm thick, so not really going far down. If you want to absorb bellow 150Hz you really got to have thicker material, or two of those as a sandwich
Most of my music for you to download at:
http://www.subconsciousmind.ch |
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Get-a-fix
Getafix
Started Topics :
147
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1441
Posted : Oct 3, 2007 18:05
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fuzzikitten
Annunaki
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40
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603
Posted : Oct 3, 2007 18:16
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Geez, 30 bucks for a bag of cloth? I'm in the wrong business... |
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subconsciousmind
SCM
Started Topics :
37
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1033
Posted : Oct 3, 2007 18:27
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On 2007-10-03 18:05, Get-a-fix wrote:
Errr the bags are just to hold the rockwool! So the super sub bass bags would hold 6 inch thick rockwool, which IS good enough
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6inch = 15cm
In THEORY, One quarter of the soundwave should be within the absorbing material to have full absorbing effect.
150Hz; Wavelength 2.2 meters (speed of sound/frequency) 330m/s / 150Hz = 2.2 meters (as for the units "Hz" is "1/s" )
so the material should have 50cm or more...
In PRACTICAL Its not that critical, but just to show, that theoreticaly for low frequency a lot of thickness is needed. as in corner traps etc.
But 6 inch, 15cm definitly is far from super sub bass.
the bag idea is great, I will do it myself next time. a little tailoring.. possible...  Most of my music for you to download at:
http://www.subconsciousmind.ch |
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Alias
IsraTrance Junior Member
Started Topics :
32
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984
Posted : Oct 3, 2007 18:50
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psychowave
IsraTrance Full Member
Started Topics :
52
Posts :
217
Posted : Oct 3, 2007 19:03
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On 2007-10-03 18:16, fuzzikitten wrote:
Geez, 30 bucks for a bag of cloth? I'm in the wrong business...
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Really!
Get-a-Fix...thanks for the suggested option..but..I agree with fuzzikitten...
I don´t will import a bag of cloth from another country...Here I can found some similar material costing a quarter of that price...without many charges of import process...
Here we have a good stuff to make all!
Thanks agains!
regards from Brazil!
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Get-a-fix
Getafix
Started Topics :
147
Posts :
1441
Posted : Oct 3, 2007 20:56
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subconsciousmind
SCM
Started Topics :
37
Posts :
1033
Posted : Oct 4, 2007 14:11
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One thing some may find wort to know.
A professional studio does NOT want 000 Refelections!!!
A pro studio wants EQUAL and mediocre reflection of soundwaves of all frequencies (whereas a little more in bass is tolerated).
Actually the prototype is a NORMAL LIVINGROOM, where the music will be played in.
The funny thing is, that a normal living room, with carpet, couch, table, curtains, furniture and all other kinds of funny obstacles results (due to its chaotic nature) in a very desired reflections behaviour. A living rooms diversity is optimal to "eat" all kinds of frequencies in an equal way, but still will not absorb them all, which would result in a "dead" sounding room.
The thing with accoustic treatment only comes into play when a room is very small or only dedicated to music, which obviously misses all the chaotic obstacles. only in that case (or when a also otherwise used room has hardfloor and few obstacles) we need to start optimising..
So before you jump on the absorbers train check if your room might not be quite optimal by its nature, cause also being your bedroom etc. etc.
Note, that small rooms are always a problem.
Most of my music for you to download at:
http://www.subconsciousmind.ch |
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