Sound Absorption Coefficients, ASTM C 423
Mounting: Type A – Material placed against a solid backing.
Product Thickness, Octave Band Center Frequencies, Hz
Type in.(mm) 125 250 500 1000 2000 4000 NRC
701, plain 1 (25) .17 .33 .64 .83 .90 .92 .70
2 (51) .22 .67 .98 1.02 .98 1.00 .90
703, plain 1 (25) .11 .28 .68 .90 .93 .96 .70
2 (51) .17 .86 1.14 1.07 1.02 .98 1.00
705, plain 1 (25) .02 .27 .63 .85 .93 .95 .65
2 (51) .16 .71 1.02 1.01 .99 .99 .95
I think it safe to say the 110Hz will pass right through and be reflected 80-90 percent of full level, while higher frequencies will be seriously attenuated. The earth it does appear is round.
For those so far and luckily unaware, SAC used to be foxfyr before he was banned from GS. I have been told he was once called MAC on HTS, also banned.
Here is a typical result from stream of bilious posts.
Quote:
11th July 2009, 07:03 PM foxfyr
This message has been deleted by jayfrigo. Reason: repeated insults, bickering, and unnecessary escalation.
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A search of posts will deliver consistent evidence of this behaviour.
One can also note a complete absence of any positive contribution to any thread, or any semblance of helpfulness. Not one.
Seeming SAC has learned from his bannings. He has learned how to work just within the rules of fora. Unfortunately we now have to learn to work around this litter.
May I express my regret to readers of this thread for having to see this unpleasantness. You will note it started with SAC post 15, a stream of insults directed towards me.
DD