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Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
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Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Klaus, would this mean that... posted by genungo on May 12, 2011 at 17:50:51:
Theory is one thing and practice another. Room mode calculators only give you a list of frequencies. However, the mode frequencies in the real room are determined by the dimensions, wall materials (acoustically soft, hard), furniture. Locations of nodes and antinodes are determined by how the room is built: wall structure, materials, openings etc. The type of loudspeaker plays a role: monopoles will couple to modes in a different manner than dipoles and cardioids.
In a smaller room you obviously do have less flexibility as regards placement of loudspeakers and listening chair, but also in small rooms placement is determining to what degree of modes are excited and perceived. Then you play music, not test tones or broadband noise, so the music has to contain frequencies that match the real mode frequencies, not the calculated ones, and the duration of the tone has to be long enough to excite the mode.
In my own room, when playing pure sine tones, the modes are easily identifiable, but with music I have found only 3 tracks so far where the 2nd order width mode is audibly excited, two of the tracks are with synthesizer, the third is, funnily enough, "Pressure points" by Camel.
Last, optimizing algorithms do consider ALL modes, not some. You never will be able to excite all modes simultaneously with normal program material, so the modes that are actually excited will be unevenly spaced on the frequency scale and the gaps between those modes may be large.
So, in my opinion also in small rooms optimum dimension ratios are useless, since they do not relate to the real life situation. i.e. real rooms, real location of speakers and listener, music playback.
Klaus
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Follow Ups
- RE: Klaus, would this mean that... - KlausR. 00:09:29 05/13/11 (0)
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