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Bass Traps?? - Page 2

post #31 of 38
Thread Starter 
Thanks for all of the replys, fellows! Here is my plan, let me know if there are any things that I should change or re-think.

For the ceiling, I will be building an 8' by 6' by 4" panel using OC-703. I will place this ceiling panel around 4 feet from the front wall, kind of in the center of the room but a little bit back from the front wall where my LCR's are at. This panel will be hung with a 4" inch gap between the top of the panel and the ceiling.

For the corners, I plan on constructing a frame out of 1" by 1" sticks that will hold some pink, flufffy insolation that is cut into triangles that are 2' feet wide at the outside, and extend inward around 12" inches and go from floor to ceiling. Does this sound ok? How much air space should I give in between the trianglur cut insolation and the actual corner of the walls? Should I use any plastic to prevent mid and high frequencies from being overly absorbed? If so, what kind of plastic should I get, and does it go on the inside or outside of the front of the frame.

For the walls, I will be building some panels out of 2" inch OC-703 that is double stacked to make 4" inches total, and there will also be a 4" inch air gap with the wall panels as well.. These will be mounted to a frame similar to the ceiling panel. I will not place any wall panels until I do some measurements with the UMM-6 mic that I am ordering to use with REW. The reason that I want to measure first is because I want to see what the ceiling panels and corner traps will do to the frequency responce and time domain, (note that I do not understand anything with regards to the time domain, I just know that its important! LoL) then I will surgically place the wall panels after figuring out where the problem areas are at.

What do you guys think about this? I am ordering the UMM-6 mic on Monday, so I can run some REW measurements soon. Just out of curiosity, what and how do I measure the time domain? What does that measurement, (ie time domain), mean as far as placing the treatments and EQ? (note that for EQ'ing the LCR's and Subs I will likely use the miniDsp unless someone can suggest a better EQ devise that isn't too expensive).
post #32 of 38
Quote:
Originally Posted by Martycool007 View Post

Thanks for all of the replys, fellows! Here is my plan, let me know if there are any things that I should change or re-think.

For the ceiling, I will be building an 8' by 6' by 4" panel using OC-703. I will place this ceiling panel around 4 feet from the front wall, kind of in the center of the room but a little bit back from the front wall where my LCR's are at. This panel will be hung with a 4" inch gap between the top of the panel and the ceiling.

For the corners, I plan on constructing a frame out of 1" by 1" sticks that will hold some pink, flufffy insolation that is cut into triangles that are 2' feet wide at the outside, and extend inward around 12" inches and go from floor to ceiling. Does this sound ok? How much air space should I give in between the trianglur cut insolation and the actual corner of the walls? Should I use any plastic to prevent mid and high frequencies from being overly absorbed? If so, what kind of plastic should I get, and does it go on the inside or outside of the front of the frame.

For the walls, I will be building some panels out of 2" inch OC-703 that is double stacked to make 4" inches total, and there will also be a 4" inch air gap with the wall panels as well.. These will be mounted to a frame similar to the ceiling panel. I will not place any wall panels until I do some measurements with the UMM-6 mic that I am ordering to use with REW. The reason that I want to measure first is because I want to see what the ceiling panels and corner traps will do to the frequency responce and time domain, (note that I do not understand anything with regards to the time domain, I just know that its important! LoL) then I will surgically place the wall panels after figuring out where the problem areas are at.

What do you guys think about this? I am ordering the UMM-6 mic on Monday, so I can run some REW measurements soon. Just out of curiosity, what and how do I measure the time domain? What does that measurement, (ie time domain), mean as far as placing the treatments and EQ? (note that for EQ'ing the LCR's and Subs I will likely use the miniDsp unless someone can suggest a better EQ devise that isn't too expensive).

from what ive read.. ez does it.. try 4 or 8 to start out then add more as needed..

he is a great link for reading

http://www.gearslutz.com/board/studio-building-acoustics/610173-acoustics-treatment-reference-guide-look-here.html
post #33 of 38
Thread Starter 
Quote:
Originally Posted by localhost127 View Post

marty, for the LF corner porous absorbers - here is a very simple design you can do that will not result in any damage to the room to place/install.

- cut two pieces of plywood (home depot can do this for you) 2' x 2' square or whatever the maximum real estate you can afford to give up.
one sheet/piece will represent the top of the structure/absorber and the other will represent the bottom.
- take four small wood studs (does not have to support much weight so you do not need to use very thick pieces of wood) and screw or nail these into each corner of the plywood face. it will look like a small dining table with four legs. flip it upside down and nail/screw down the other plywood section to the studs.

if you have a ~8ft+ ceilings, then it is best to make 2x 4ft absorbers for each corner - which would then be stacked on top of each other floor-to-ceiling. cut the length of the wooden support studs to whatever is needed based on ceiling height.

you can now fill this empty 2' x 2' x 4' "container" loosely with pink fluffy fiberglass insulation. please take care to align the insulation in the same orientation (stack the layers neatly). do NOT compress the insulation; fill it loosely.

wrap the rectangular structure (now filled loosely (uncompressed) with pink fluffy attic insulation) in 6mil plastic (can be found in the paint section of the hardware store). the plastic will contain the fibres and reflect some specular energies back into the room (you only care about LF absorption for this specific treatment). staple the plastic sheeting to the wood studs. for looks, you can also wrap the absorber in your choice of fabric - but not necessary for functionality.

repeat until you have constructed the required amount of 2'x2' (x4' tall) LF porous absorbers. stack to floor/ceiling and place in any other available corners (2D/3D corners).

Thanks for the idea Localhost! I will be starting on my corner, pink fluffy bass traps first thing in the morning! I will cut a square of scrap plywood into 2' x 2' pieces, then use wooded dowls to extend the scrap plywood end caps from floor to ceiling in each corner filled with the pink fluffy stuff.

My question is which of the brands and models of pink fluffy stuff should I use?

Also, shouldn't there be an air gap between the trap and the wall? How should the 2' x 2' x 8' trap be oriented in the corner in order to have the necessary air gap?
post #34 of 38
Quote:
Originally Posted by Martycool007 View Post

Also, shouldn't there be an air gap between the trap and the wall? How should the 2' x 2' x 8' trap be oriented in the corner in order to have the necessary air gap?


there does not need to be an air-gap - it is merely a "free lunch" in some cases as the amount of material (insulation) required can be minimized (the air-gap is a substitute for the additional material - as the remaining material is spaced away from the rigid boundary (via the air-gap) into areas of higher particle velocity for the longer/lower wavelengths). for pink fluffy LF corner absorbers, just (loosely!) fill the trap. dont forget you can also place these LF absorbers in other 2D corners within the room (floor/wall boundary) if you have free real estate in those areas to attack those respective axial modes.

dependent on your real estate constraints, you can then pull the absorbers out and away from the wall slightly and take multiple measurements to identify whether any noticeable improvement in your room at the listening position(s) is possible. with measurement eq, feel free to experiment and explore!
post #35 of 38
Thread Starter 
Thanks for the advise, Localhost127! I still need to figure out which brand and model of the pink fluffy stuff to get? There seem to be a ton of them at both Lowes and Home Depot. Which R-Values are the best of low frequency./corner traps? Which brand should I go with? Are there any particular brands or model of "the pink fluffy stuff" that I should stay away from?
post #36 of 38
Quote:
Originally Posted by Martycool007 View Post

Thanks for all of the replys, fellows! Here is my plan, let me know if there are any things that I should change or re-think.

For the ceiling, I will be building an 8' by 6' by 4" panel using OC-703. I will place this ceiling panel around 4 feet from the front wall, kind of in the center of the room but a little bit back from the front wall where my LCR's are at. This panel will be hung with a 4" inch gap between the top of the panel and the ceiling.

For the corners, I plan on constructing a frame out of 1" by 1" sticks that will hold some pink, flufffy insolation that is cut into triangles that are 2' feet wide at the outside, and extend inward around 12" inches and go from floor to ceiling. Does this sound ok? How much air space should I give in between the trianglur cut insolation and the actual corner of the walls? Should I use any plastic to prevent mid and high frequencies from being overly absorbed? If so, what kind of plastic should I get, and does it go on the inside or outside of the front of the frame.

For the walls, I will be building some panels out of 2" inch OC-703 that is double stacked to make 4" inches total, and there will also be a 4" inch air gap with the wall panels as well.. These will be mounted to a frame similar to the ceiling panel. I will not place any wall panels until I do some measurements with the UMM-6 mic that I am ordering to use with REW. The reason that I want to measure first is because I want to see what the ceiling panels and corner traps will do to the frequency responce and time domain, (note that I do not understand anything with regards to the time domain, I just know that its important! LoL) then I will surgically place the wall panels after figuring out where the problem areas are at.

What do you guys think about this? I am ordering the UMM-6 mic on Monday, so I can run some REW measurements soon. Just out of curiosity, what and how do I measure the time domain? What does that measurement, (ie time domain), mean as far as placing the treatments and EQ? (note that for EQ'ing the LCR's and Subs I will likely use the miniDsp unless someone can suggest a better EQ devise that isn't too expensive).

I'm thinking that you might want to run your proposed designs through this:

http://www.whealy.com/acoustics/Porous.html

It can show you what happens when you space absorbers away from the wall, etc.
post #37 of 38
R-value is irrelevant for this application; get whatever is cheapest.
post #38 of 38
Quote:
Originally Posted by Martycool007 View Post

Thanks for the advise, Localhost127! I still need to figure out which brand and model of the pink fluffy stuff to get? There seem to be a ton of them at both Lowes and Home Depot. Which R-Values are the best of low frequency./corner traps? Which brand should I go with? Are there any particular brands or model of "the pink fluffy stuff" that I should stay away from?

your looking for acoustic insulation.. im up in Canada only product handy to get here is safe n sound rouxol.. at hd or lowes. you need to look up your stc ratings of the product to determine how
thick you need it.. for the waves your looking to trap..

cheers..
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