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In Reply to: RE: I believe your example supports my 'theory' posted by amdan on October 17, 2009 at 14:10:28
If foam traps make a difference but fibreglass wrapped in plastic does not, then I'd look to reasons other than a thin plastic sheet. If you search here, you will find many people who report great success with fibreglass covered with a thin sheet in order to prevent fibre release and, as Ethan says, actually bonding the sheet to the fibreglass as a limp membrane can actually improve bass absorption.
So, what other reasons could there be? The following come to mind but I wouldn't suggest this is a full list:
- you've got the trap placed behind something solid that's blocking the sound path, or you've placed the fibreglass trap behind another trap which is doing the bulk of the work so the fibreglass trap adds little/nothing to what you were getting previously;
- the fibrglass isn't dense enough to absorb bass or it's so dense it's reflecting bass frequencies;
- where you have them placed isn't an ideal location for bass trapping;
- you've already got so much bass trapping in the room that you're getting significant bass smoothing already and the addition of the fibreglass traps isn't sufficient to make a significantly audible improvement to the results you're already getting
David Aiken
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