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Over 100Hz. (+/-3dB) w. pink noise w. 1/3 octave smoothing & under 100Hz. (+0/-6dB) using sine waves

My speaker building goals, measured at the listening position, and averaging two measurements spaced 8 inches apart (to represent right and left ears):

Over 100Hz. you must use pink noise and 1/3 octave smoothing because sine waves without smoothing will reveal horrible 1/4 wavelength (combfilter) cancellations that look bad but are unlikely to be audible except in the upper bass. Averaging four measurements (microphone array) is likely to be more accurate than averaging two measurements.

Below 100Hz. you must use sine waves spaced less than 1/6 octave apart to excite standing waves. You can only get +0dB by using parametric EQ. Otherwise you'll have one or more peaks typically +3 to +6 dB. If you have a lot of flexibility to move your listening seat, you may find a location with no standing wave nulls worse than -6db -- but typically there is least one -6 to -12dB null under 100Hz.
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Richard BassNut Greene
Subjective Audiophile 2007


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