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REW Room EQ Wizard test variations (1 Viewer)

Truett

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We are planning to put surrounds, heights, and ceiling speakers behind wall fabric. We want to test how the different wall fabrics affect the sound. I have set up a single Focal 1000 ICW6 In-wall speaker to test various fabric coverings for frequency response with REW Room EQ Wizard. So far we have tested with no grill, metal grill that comes with the speaker, and a thick cotton shirt, because we do not yet have the fabric samples large enough. They are coming.

Why is every sweep that we do different? Every one of them. We've done dozens in each setup. We eliminated the outliers, and we can certainly see a theme. But is this variation on a test normal? It can be 5 to 10 DB different at some frequencies on one test to another.
 

JohnRice

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What kind of microphone are you using? How is it set up?
 

Truett

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Using UMIK-1 microphone. Here are 5 sweeps. One after the other. Could it have to do with not enough input? If I go louder, it clips.
REW Sweeps Same speaker.jpg
 

Truett

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The IN and REFERENCE IN meters are way low. Not even close to the OUT meter which is at -12db. But the sound is pretty loud.
 

ManW_TheUncool

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Hmmm... that seems like rather odd sweeps results... unless you have them normalized to some kind of reference SPL to yield zero-or-lower values at the extremes where the speakers would basically be at their quietest/lowest (of effectively no real signal output).

I've never actually used REW before, but did you maybe choose some setting that basically makes ambient room noise be a reference zero SPL or something like that? IF so, that would make some sense of your results. Your ambient room noise level could easily be 25-35db (or possibly higher)... and might also vary, if you're not careful about that...

_Man_
 

Truett

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We found a setting in Windows 11 that was causing microphone to mute because of background noise I think. Now our readings are much higher! I will report back after we play with it more.
 

John Dirk

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Also make sure you are loading the appropriate calibration file for your mike.
 

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