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Quote:
Originally Posted by jsil /forum/post/21308357


Hi guys,

I'm in CA and was wondering if anyone now's where to find a dealer out here thanks.

I used MacArthur Co, they were quite helpful - good prices, and I could order by the sheet vs. the bundle. Looks like they have an office in San Jose:

http://www.macarthurco.com/contact-us
 

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Brad Horstkotte,


Called them and they have it in stock thanks.
 

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Where can I get a step by step on building bass traps and panels to hang on walls. What about the space between the wall and panels.
 

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Quote:
Originally Posted by jsil /forum/post/21313708


Where can I get a step by step on building bass traps and panels to hang on walls. What about the space between the wall and panels.

Here's a good resource for making the SuperChunk style of corner absorbers: http://forum.studiotips.com/viewtopic.php?t=535


Building panels is pretty easy really, you build a wooden frame, cover it with fabric (staple to the back of the frame), and rigid insulation fits in behind the fabric. Looking here might give you some ideas:

http://www.acoustimac.com/index.php/...ic-panels.html
 

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Quote:
Originally Posted by Bill Fitzmaurice /forum/post/21275191


+1. They should be called midbass traps, as that's as low as they're effective to. They're called bass traps as they help control boom, which is associated with bass, although actually sourced in the midbass.

this is not accurate.

effectively designed and placed porous absorption can make an impact down to 40hz.
 

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as FOH stated, materials with low gas-flow resistivity (eg, pink fluffy attic insulation) are most effective for LF bass traps compared to OC703, OC705, etc.


even 34" corner chunks made with pink fluffy will perform better. if you stack cuts of pink fluffy, you need to add horizontal support every few feet such that the weight of the upper layers do not compress the layers at the bottom.


it is more wise to 'hang' the pink fluffy from the ceiling down, such that there is no need for the horizontal supports or compression.


eg, if you have an 8ft ceiling, then you will hang the first piece from the ceiling (8ft tall) all the way into the corner. you will need to cut the width down to say, 4" or so for the first first layer that is deepest into the corner. the next layer you hang (as the corner opens up), will be slightly wider (8"), and then keep adding layers until you are at 34" wide (faced), or extend even further if you have the room.


while it may seem unconventional that lower GFR material is more effective at LF absorption, like many things in acoustics, what is assumed or intuitive is not always correct.


use the cheaper (and more effective) pink fluffy attic insulation for corner porous bass traps, and save the expensive OC703 for broadband specular reflection absorbers.
 

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Quote:
Originally Posted by Fatawan /forum/post/21281126

http://www.bobgolds.com/AbsorptionCoefficients.htm


Note how the ultra touch cotton has very good absorption--see if your local Home Depot has it

anyone referencing those absorption coefficients needs to pay care to the 2nd paragraph on that page.


it is important to understand what those values mean - reverberant chamber coefficients can be used as a comparison to other products - but those values are not directly applicable to a small acoustical space such as your room.
 

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Where are you guys buying your fabric from.
 

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Quote:
Originally Posted by jsil /forum/post/21308357


Hi guys,

I'm in CA and was wondering if anyone now's where to find a dealer out here thanks.

Just look in the Yellow Pages for "HVAC" or "Heating and Cooling" suppliers. THEY are the people who use most of this rigid fiberglass insulation for covering heating and cooling ducts. They are usually located in your local industrial park along with all the other suppliers of contractors.


I had a hell of a time finding this stuff until I followed the advice I just gave you. It's very cheap. A few bucks a sheet. Warning: the pros price it by cubic foot. So be prepared to say something like: "I need 16cubic feet of rigid fiberboard insulation" for them to understand you. They may give you an option of thickness, but my local HVAC warehouse only had 2" stuff in stock.


If you are ordering it online or driving 2 hours to get it... you are doing it wrong. HVAC suppliers are everywhere.

Quote:
Originally Posted by jsil /forum/post/21320344


Where are you guys buying your fabric from.

Go to your local fabric store and look for thin polyester (also know as Gabardine by some) in the color you want. You will often see people referring to "Guilford of Maine" acoustical cloth like it's something special. It's not. It's just polyester cloth. Depending on building codes, (and if you even care about them) you may need to make sure the cloth has the proper fire resistance.


Acoustic treatments are dirt cheap, if you know where to look for the stuff.


I just wrapped the cloth over the panels and secured it with sewing stick pins (you know, the ones you have to remove from new clothes) then impaled them on the wall on a row of finish nails I tacked partway in to the wall at an angle. Rock solid, lightweight, easy to move, simple and cheap.
 

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Quote:
Originally Posted by jsil /forum/post/21320344


Where are you guys buying your fabric from.

triple velvet (screen wall): syfabrics.com

speaker cloth (column faces - in front of speakers): rosebrand.com

Guilford of Maine (wall panels): fabricmate.com

Commando Cloth (soffit): magnafabrics.com

marine vinyl (column sides): allvinylfabrics.com
 
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Going to start building me some bass traps. Better to use 2" or 4" for corner bass traps.
 

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Mineral wool also works well for superchunks - I used Roxul AFB, Safe N Sound is about the same I believe. It cuts easily with an electric carving knife ($15 at Target), stacks just like OC 703 so doesn't need any special support, and is usually cheaper.

Or just follow this guy and hope some of it falls off his truck:

Did you take this picture... I laffed.

On a side note... any updates on a good place to buy this stuff?
 

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Haha yeah, took that picture driving to work one day (yeah I know, naughty boy).

The place I bought it from is called MacArthur Co. - macarthurco.com . Check their website for locations.
 

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What would you guys recommend for covering a baffle wall with for absorption? Would OC703 be optimal? What about Safe-N-Sound?

Can anyone recommend a decent place to purchase OC703 online? I live in a rural area and the closest metropolitan area is Memphis Tennessee, but, even that is 2 hours away. I would definitely be willing to drive to Memphis, though, if I could find it cheaper.
 

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What would you guys recommend for covering a baffle wall with for absorption? Would OC703 be optimal? What about Safe-N-Sound?

Can anyone recommend a decent place to purchase OC703 online? I live in a rural area and the closest metropolitan area is Memphis Tennessee, but, even that is 2 hours away. I would definitely be willing to drive to Memphis, though, if I could find it cheaper.

There's a lot of guys that have used Linacoustics with good results to treat their front walls.
 
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