DIY Broadband Absorbers (w/ 703)

I play in a ban · 11th May 2005, 11:22 PM

I am about to buy some O.C. 703. First off, I was wondering how thick I should buy (I was thinking 2 inches).

Also, do you guys know of any DIY plans for 703 absorbers?

Thanks in advance as always.

- Bill

JonCraig · 12th May 2005, 02:12 AM

google

I play in a ban · 12th May 2005, 02:38 AM

Quote:

Originally Posted by JonCraig

google

Yes, that's where I found out about 703 ;)

I wanted opinions from some people on the board on plans they found worked well..

brianroth · 12th May 2005, 06:29 AM

I've seen an absorber built from a "stack" of 1" of 701 facing into the room, with 2 pieces of 1" 703 behind that with another two pieces of 1" 705 at the rear. It's supposed to be better for broad band absorption.

Bri

norman_nomad · 12th May 2005, 07:04 AM

I've built about 8 traps for my studio. The traps are 4 inches thick composed of 703 w/ FRK siding (2 x 2'' pieces sandwiched together). The FRK siding (looks like foil on one side) is supposed to have better absorption properties, but I haven't actually done any comparison tests between the normal 703 and FRK faced 703.

I covered the two pieces in maroon burlap then "framed" them with stained wood planks. They look pretty sharp and cost me about $35 each.

Placing the traps in the corners of my uninspiring rectangular (cringe) control room made a noticeable difference. Remember, all corners count: wall meets wall, wall meets ceiling, wall meets floor.

I did some A/B sine sweep tests in the room both before absorption and after absorption. My sine sweep was played at about 85 db and captured by a fairly neutral omni mic, and only swept frequencies from 20hz - 500hz (seemed to be the biggest problem in my room). The traps did a great job of evening out the frequencies from around 150hz to 500hz, but did little to nothing below 150hz. I really just wish I had a bigger control room!

Hope this helps!

midigod · 12th May 2005, 04:58 PM

I built 25 or 30 for my studio, out of 2 layers of 2" rockwool. But you can still use the same construction:

http://www.pmerecords.com/broadband.cfm

-Craig

caseyLA · 12th May 2005, 07:32 PM

If you don't want to mess with fabric coverings, you can buy a version of 703 that is faced with a black "skin". It's Owens Corning "Select Sound".

http://www.geocities.com/thatwascasey

I made 16 of those. One layer of regular 2" 703 plus a top layer of 2" Select Sound. Framed with MDF. Placed at all corner juctions and first reflection poins, they absorb down to about 60 Hz.

AnalogUniverse · 12th May 2005, 07:58 PM

If you haven't been to http://forum.studiotips.com it's a valuable resource, also www.bobgolds.com

exit2studios · 12th May 2005, 09:10 PM

How much more is the "Select Sound" compared to normal 703?

11th May 2005, 11:22 PM	#1
I play in a ban Gear addict Join Date: Jan 2005 Location: Jersey Posts: 465	DIY Broadband Absorbers (w/ 703) I am about to buy some O.C. 703. First off, I was wondering how thick I should buy (I was thinking 2 inches). Also, do you guys know of any DIY plans for 703 absorbers? Thanks in advance as always. - Bill __________________ The painting was a gift Todd.......and I'm taking it with me.

12th May 2005, 02:12 AM	#2
JonCraig Lives for gear Join Date: Apr 2004 Location: Nashville, TN Posts: 1,801	google __________________ "My job is to make music sound great and to not whine too much." --George Massenburg Learn PT Techniques from Multi-Platinum Engineers. Click Here.

12th May 2005, 06:29 AM	#4
brianroth Lives for gear Join Date: May 2005 Location: Oklahoma City Posts: 1,247	I've seen an absorber built from a "stack" of 1" of 701 facing into the room, with 2 pieces of 1" 703 behind that with another two pieces of 1" 705 at the rear. It's supposed to be better for broad band absorption. Bri __________________ Brian Roth Technical Services Oklahoma City, OK www.BrianRoth.com

12th May 2005, 09:10 PM	#9
exit2studios Gear nut Join Date: Mar 2005 Location: Austin, Tejas Posts: 107	How much more is the "Select Sound" compared to normal 703? __________________ "we receive our information from comedians and laugh at politicians" exit2studios

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12th May 2005, 07:04 AM	#5
norman_nomad Lives for gear Join Date: Mar 2004 Location: San Francisco, CA Posts: 2,268	I've built about 8 traps for my studio. The traps are 4 inches thick composed of 703 w/ FRK siding (2 x 2'' pieces sandwiched together). The FRK siding (looks like foil on one side) is supposed to have better absorption properties, but I haven't actually done any comparison tests between the normal 703 and FRK faced 703. I covered the two pieces in maroon burlap then "framed" them with stained wood planks. They look pretty sharp and cost me about $35 each. Placing the traps in the corners of my uninspiring rectangular (cringe) control room made a noticeable difference. Remember, all corners count: wall meets wall, wall meets ceiling, wall meets floor. I did some A/B sine sweep tests in the room both before absorption and after absorption. My sine sweep was played at about 85 db and captured by a fairly neutral omni mic, and only swept frequencies from 20hz - 500hz (seemed to be the biggest problem in my room). The traps did a great job of evening out the frequencies from around 150hz to 500hz, but did little to nothing below 150hz. I really just wish I had a bigger control room! Hope this helps!

12th May 2005, 04:58 PM	#6
midigod Gear maniac Join Date: Oct 2004 Location: Colorado Posts: 175	I built 25 or 30 for my studio, out of 2 layers of 2" rockwool. But you can still use the same construction: http://www.pmerecords.com/broadband.cfm -Craig

12th May 2005, 07:32 PM	#7
caseyLA Gear nut Join Date: Sep 2004 Location: Los Angeles Posts: 111	If you don't want to mess with fabric coverings, you can buy a version of 703 that is faced with a black "skin". It's Owens Corning "Select Sound". http://www.geocities.com/thatwascasey I made 16 of those. One layer of regular 2" 703 plus a top layer of 2" Select Sound. Framed with MDF. Placed at all corner juctions and first reflection poins, they absorb down to about 60 Hz.

12th May 2005, 07:58 PM	#8
AnalogUniverse Gear nut Join Date: Mar 2005 Location: Northeast U.S. Posts: 138	If you haven't been to http://forum.studiotips.com it's a valuable resource, also www.bobgolds.com

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