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In Reply to: RE: Comb filters posted by KlausR. on July 02, 2009 at 10:48:58
> Floyd Toole recommends to use absorbers that work down to at least 200 Hz, which in the case of porous absorbers means 17 inch thickness. <
David already straightened out that myth, and I can do one better. I recently made a video showing 6-inch thick bass traps making quite a large improvement to below 40 Hz:
Hearing is Believing
Also, we have to be clear in what is being improved and by how much. Nulls are often the biggest problem, especially in very small rooms. It does not take 100 percent absorption to make a very large improvement in a null! Even 25 percent absorption will reduce a null that's infinitely deep to only 18 dB deep, and 50 percent absorption reduces a null to only 11 dB deep.
--Ethan
Nice video...
As mention before, I find its more enjoyable to listen music in a diffuser room than a absorbing room, the micro dynamic is enhanced by the diffuser ,and the loudspeaker/room also seem disappear better...
...for those who have proper(diffuser that able to diffuser above 12Khz at least) diffuser,can try this,put some diffuser on ceiling,side wall ,listener front and back wall (reflection point or not is not important), use little loudspeaker(less than 15 degree) toe in , you will get very beautiful sound from the setup~~ imagine high frequency reflection is weaken but sustain longer in time domain and those "airyness" will spread evenly and occupied every inch of room,the loudspeaker now sound like it have a much wider and better High frequency dispersion pattern; it's definitely a kind of coloration , and I think it's not exactly what Mixing engineer want in their control room ..... but, it's music enjoyment!
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