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Audio and Video Talk
Acoustics & Room Treatment
Limp mass membrane for bass traps
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<blockquote data-quote="Timber_MG" data-source="post: 219250" data-attributes="member: 18"><p>For above the Schr?der frequency I would look at an RT60 time plot in octave bands or so rather than a CSD to give you a clearer picture of what's happening. </p><p></p><p>The LF graphs show some improvments from ~60Hz and up with the resonant peaks being widened and dropped in relative level(means they've been damped). Broad band absorbtion is usually best placed behind the listener if you're close to the back wall and at the first reflection points. The nature of resistive damping is such, that your modes will move around slightly as one can see in one of the earlier posts.</p><p></p><p>The problem with bass in small rooms (acoustical term encompassing all domenstic rooms) is that to have a marked effect one really needs to cover a significant portion of the room area, meaning more corners or even more walls. At high frequencies this might not pose much of a problem (I personally don't like over-damped rooms) but with decreasing frequency the size (and hence instrusiveness and expense) of such measures increases rapidly.</p><p></p><p>The Fraunhofer instritute has developed some interresting IP around pressure absorant panels (see Renz and RPG's new lines) but the cost and lack of availablility of the foams involved makes such treatment options very costly.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 219250, member: 18"] For above the Schr?der frequency I would look at an RT60 time plot in octave bands or so rather than a CSD to give you a clearer picture of what's happening. The LF graphs show some improvments from ~60Hz and up with the resonant peaks being widened and dropped in relative level(means they've been damped). Broad band absorbtion is usually best placed behind the listener if you're close to the back wall and at the first reflection points. The nature of resistive damping is such, that your modes will move around slightly as one can see in one of the earlier posts. The problem with bass in small rooms (acoustical term encompassing all domenstic rooms) is that to have a marked effect one really needs to cover a significant portion of the room area, meaning more corners or even more walls. At high frequencies this might not pose much of a problem (I personally don't like over-damped rooms) but with decreasing frequency the size (and hence instrusiveness and expense) of such measures increases rapidly. The Fraunhofer instritute has developed some interresting IP around pressure absorant panels (see Renz and RPG's new lines) but the cost and lack of availablility of the foams involved makes such treatment options very costly. [/QUOTE]
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Audio and Video Talk
Acoustics & Room Treatment
Limp mass membrane for bass traps
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