It's quite interesting that in Europe calculation of building acoustics uses a different method which is arguably more accurate and uses 1/3 octave bands across the full acoustic spectrum then weighting those values depending on psychoacoustic factors (dbA weighting) then the analysis of materials can take into account the resonance of specific materials and cavities.
If you're trying to add up different materials in a room , then Total absorption = ( Surface Area x coefficient) + ( Surface Area x coefficient) + ... Or in other terms, you calculate each surface into Sabins, and then total up all your Sabins :)
Started out in lively theater halls, switching out seat cushions and measuring reverb time, then developing the absorption coefficient based on that. It's a little more scientific now. Look up Reverberation Chamber Method, Impedance Tube Method, Tone-Burst Method
Hey mike thanks for the knowledge but iam interested to know ,if i put foam mounted with a frame and the air space behind instead of glass fiber would i get the same results on a concrete wall,and what is the absorpition coeefficient of foam ? And what makes so important to leave a space behind when your making acoustic panels Thank You
+CONGA MUSIC The foam used will most likely not be as absorbent due to its density, although it would probably absorb some of the noise. The space you leave open behind allows the noise that is not absorbed to bounce back through the foam and undergo another wave of absorption.
No, it can't be negative because it is a percentage of incident sound energy absorbed by a material. The sound will reduce but it won't be negative amount.
It's quite interesting that in Europe calculation of building acoustics uses a different method which is arguably more accurate and uses 1/3 octave bands across the full acoustic spectrum then weighting those values depending on psychoacoustic factors (dbA weighting) then the analysis of materials can take into account the resonance of specific materials and cavities.
What tools can be used to simulate an acoustic space?
How do you combine absorption coefficients?
If you're trying to add up different materials in a room , then Total absorption = ( Surface Area x coefficient) + ( Surface Area x coefficient) + ... Or in other terms, you calculate each surface into Sabins, and then total up all your Sabins :)
Thank you for this!
Hi.
How about material coefficient at 60 and 80 Hz? It can absorb.
How can one calculate the sound absorption coefficient?
Started out in lively theater halls, switching out seat cushions and measuring reverb time, then developing the absorption coefficient based on that. It's a little more scientific now. Look up Reverberation Chamber Method, Impedance Tube Method, Tone-Burst Method
what they use ? material?
Hey mike thanks for the knowledge but iam interested to know ,if i put foam mounted with a frame and the air space behind instead of glass fiber would i get the same results on a concrete wall,and what is the absorpition coeefficient of foam ? And what makes so important to leave a space behind when your making acoustic panels Thank You
+CONGA MUSIC The foam used will most likely not be as absorbent due to its density, although it would probably absorb some of the noise. The space you leave open behind allows the noise that is not absorbed to bounce back through the foam and undergo another wave of absorption.
HI, can an acoustic related to Helmholtz-resonator ?
Whats the name of the software used on the 3d?
Hi..is that possible to have negative sound absorption coefficient? If yes, why?
Hi, to answer your question. No, you can't have a negative sound absorption coefficient.
No, it can't be negative because it is a percentage of incident sound energy absorbed by a material. The sound will reduce but it won't be negative amount.
This is total nonsense!