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Coaxial speaker - near-field measurements. Correct microphone placement?

Snoop

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Sep 2, 2023
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Hello,
I would like to measure the Fluid Audio FX80 speaker (quasi-anechoic method). I encountered trouble with near-field measurements cause I didn't know how to set up the microphone (UMIK-1). It should be as close as possible to the center of a speaker's diaphragm but there is a waveguide for twitter. I tried to set it in front of twitter, but the result is: hard to splice results. Port and near field measurements are way apart - 28db SPL. I am following the procedure from this thread :

How to make quasi-anechoic speaker measurements/spinoramas with REW and VituixCAD

Is it correct to place the microphone in front of the central tweeter or should I place it between the woofer membrane and wave guide ?

Thank You for the clarification!
20230906_130535.jpg
 

fpitas

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I'd place it right on-axis. Sometimes a coaxial will have a treble null there, so don't be surprised.
 

fineMen

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Hello,
I would like to measure the Fluid Audio FX80 speaker (quasi-anechoic method). I encountered trouble with near-field measurements cause I didn't know how to set up the microphone (UMIK-1). It should be as close as possible to the center of a speaker's diaphragm but there is a waveguide for twitter. I tried to set it in front of twitter, but the result is: hard to splice results. Port and near field measurements are way apart - 28db SPL. I am following the procedure from this thread :

How to make quasi-anechoic speaker measurements/spinoramas with REW and VituixCAD

Is it correct to place the microphone in front of the central tweeter or should I place it between the woofer membrane and wave guide ?

Thank You for the clarification!
View attachment 310055
:) by design a 'nearfield' won't work. You may want to get back asking what you want to achieve,
 
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