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17th January 2008
| #1 |
| Gear maniac  Joined: Dec 2006 Location: Richmond, VA
Posts: 233
Thread Starter | Help with UltraTouch Cotton Choice
I am going to build my own traps this weekend and will be making wood frames wrapped in Guilford of Maine FR701. I am picking up the insulation at a local supplier this Saturday morning. My quesiton... How much of a difference should I notice if I use R21 instead of R13. The absorption coefficients are pretty close between the two products down to 125Hz. Is the main difference going to be more effectiveness in the R21 below 125Hz? |
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17th January 2008
| #2 |
| Lives for gear  Joined: Jul 2006 Location: southern Maine
Posts: 1,309
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Yes. Thicker = lower. Also, be warned that cotton absorbers are quite floppy. I'm a big fan of cotton in acoustics, but you need to account for this when you build your absorbers if you want them to look good.
__________________ The acoustic treatment experts |
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17th January 2008
| #3 | |
| Gear Guru  Joined: Jul 2005 Location: Atlanta, GA
Posts: 11,995
| Quote:
As JWL said the ultraTouch is not as rigid so you may want to make a frame for it. Glenn
__________________ Glenn Kuras GIK Acoustics USA GIK Acoustics Europe 770 986 2789 (USA) +44 (0) 20 7558 8976 (UK) See the NEW Scopus Tuned Trap  | |
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17th January 2008
| #4 |
| Gear maniac Joined: Dec 2006 Location: Richmond, VA
Posts: 233
Thread Starter |
Thanks a lot for the help. I will be using wooden frames to build the traps to allow for a crisp appearance instead of a couch cushion in the corner. When I use the R21, which is 5.5 inches thick, should I compress it any with the frame, or build the frame thick enough so that the cotton simply sits inside with support so it doesn't sag? I designed the frames to be open around the sides to maximize area and will probably use jute cord threaded through small holes in the frame to support the cotton. |
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17th January 2008
| #5 |
| Gear Guru Joined: Jul 2005 Location: Atlanta, GA
Posts: 11,995
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Just lay it in the frame. Thickness matters.  Glenn |
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17th January 2008
| #6 | |
| Gear maniac Joined: Dec 2006 Location: Richmond, VA
Posts: 233
Thread Starter | Quote:
Thanks Glenn. When I ultimately fail in this endeavor and waste a few hundred bucks trying to make decent looking traps, I will end up calling you and placing an order for your traps. | |
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17th January 2008
| #7 | |
| Gear Guru Joined: Jul 2005 Location: Atlanta, GA
Posts: 11,995
| Quote:
All kidding aside, good luck on them. You will be amazed at the difference acoustics make. Glenn | |
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16th September 2008
| #8 |
| Gear interested Joined: Sep 2007
Posts: 11
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How did this project work out, btw? I just bought some R21 ultratouch myself and am thinking through exactly how I want to get it framed and mounted. -b |
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