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--- audio:rew:smoothing [2025/12/21 18:10] – created oscar
+++ audio:rew:smoothing [2025/12/21 18:12] (current) – oscar
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 {{ :audio:REW-average-1.jpg?400 |}}
-==== Multiple Averaged Measurements ====
-=== Measuring ===
-In REW it is possible to average a number of measurements. The idea behind this is to eliminate over-corrections which validity is limited to the exact place where the microphone has been setup in case of a single measurement. Use an imaginary cube of 25 cm around your hear position and perform +/- 5 measurements all at ear height with the mic always pointing to the front wall (or to the ceiling if your mic
-is designed that way and it has 90 degrees calibration file). Resulting in a total of 10 measurements for
-two speakers - to the left, right, front and rear of the LP each around 25 cm away from LP. If you
-consider bass upper frequency limit to be 200 Hz which converts to a wavelength of 43 cm, a 50 cm
-wide (25 x 2) measurement area seems to cover enough of the bass waves.
-For the center head position, take two measurements for Left and Right speakers as this is
-the most important location. Using two measurements at the LP will give a slight bias to the central position during averaging. Keep both measurements if they are identical (they should be
-identical at least past the speaker’s lowest bass frequency capacity). If they are not identical it is
-probably caused by some unwanted environmental noise during measurement, you should delete
-the irrelevant looking one.
-=== Time Alignment ===
-Before averaging make sure that all measurements are time aligned prior to making any kind of algebra on these measurements. Select the corresponding measurements inside the ‘All SPL’ tag of REW and use the ‘Time Align’ function in the Control window.
-__Do not align IR starts!__