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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: Room mode peaks and nulls posted by Chaba on February 12, 2009 at 00:49:22:
All calculators are using equations which are based on the assumption that the room is empty, has no wall openings and has perfectly reflecting walls.
Large pieces of furniture are able to split modes and, when absorptive, to provoke slight shifts in mode frequencies.
Wall openings, being points of structural weakness, result in shift of the locations of mode nodes and antinodes.
When the loudspeaker is on a mode peak, it will excite the mode fully, when it's on a mode null, it will not excite it at all. On positions between peak and null it will excite the mode proportionally. The same line of reasoning applies for mode perception.
Resuming the above, room mode calculators give approximate results only, set up your system and listening chair and see if there are any problems at the listening position when playing music.
I've placed loudspeakers and listening sofa without any regard to mode issues. The ceiling is acting as membrane absorber, so the modes are damped, but they are still there, as I easily see when playing pure sine tones. When playing music, however, I have discovered only three tracks so far where modes are excited.
Klaus
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Follow Ups
- Room mode calculators - KlausR. 02:31:36 02/12/09 (1)
- Thanks Klaus! - Chaba 09:59:04 02/12/09 (0)
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