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May 12, 2008 - 6:49pm
#1
How Do I Actually Measure the Acoustic Modes of My Listening Room?
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I suggest that there are easier ways to do this but I must admit that I am not familiar with the tools you intend to use. The descriptions of their applications are vague to me and do not seem directly relevant to the problems of room modes and room acoustics. I suggest that you look at Everest's Master Handbook of Acoustics and consider playing with Room EQ Wizard (freeware) to see the general and usual approaches to this. It would be interesting to see how one can apply this binaural device to them.
Kal
I've already looked at the theoretical mode stuff, however, my listening room is my living room and its slightly different that a normal box. It was a huge cutout on one wall that goes into the kitchen 4 feet higher than the living room. I assume that to determine all of this room acoustics a simple sound pressure readings would be suffice, but since my knowledge is in suppressing noise from structure born resonances, this is slightly out of my knowledge base.
Oh and their application is - the headset is two sound pressure transducers, (a mic) one on each ear. The 4 channel analyzer is basically a small FFT analyzer that takes the Time Domain data from the mic and runs a Fast Fourier Transform to take it to the Frequency Domain. We typically use the device on flights and in automobiles to get actual noise data at the ear positions in different locations.
Yeah. I got that but it is still not clear to me that it offers any advantages unless it is accompanied by appropriate application software and that I do not see. For example, ETF/RplusD will not only do analysis but make suggestions for correction. http://www.etfacoustic.com/RPlusDSite/index.html
Kal
Stop right there. Music is unsuitable for room testing because it contains only those frequencies related to that music's key. Kal's suggestion to read up on ETF/R+D is what I'd have said if he didn't beat me to it. You may find my write-up useful too:
Using ETF
--Ethan