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Old 23rd January 2010, 01:57 PM   #1
gabdx is offline gabdx  Canada
diyAudio Member
Join Date: Jan 2008
Default Mesuring speaker response Question for the community

When using sinusoidal waves to measure each frequency response of the speaker, you place the microphone at 1m and donít move it. What should you do about the peaks and valleys of the sound waves propagated in the air and hitting the microphone? The 'knots' and the 'peaks' of the waves seem to change place in the room depending on the frequency generated... When a knot hits the microphones there is a substantial drop in sound pressure measured, even if the speaker is linear in the response! Should you compensate for this problem or adjust the speaker until the knot are aligned for all frequency / or compensated by making an uneven sound response???

If you compensate peeks and valleys in the sound graph, will this be true for measurements at a 1.5 m or 2 m?

How, why, and should you even bother to get an even response of the sinusoidal pattern at a particular spot in the room???

I wonder how designers cope with this problem which can affect measurements quite a lot +-Db especially in the top frequencies.

Unlike live music, speakers are mostly unidirectional and generate peeks and valleys, my intuition would be that since music is not sinusoidal these problems DO NOT arise when music is played through the speakers.
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