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Old 21st June 2021, 12:57 AM   #1
mr ed is offline mr ed  United States
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Default REW help

Can any of you experience members help me understand how to interpret this spectrum graph?
Thank you from a complete novice.
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Old 21st June 2021, 02:22 AM   #2
hollowboy is offline hollowboy  Australia
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I'm no expert either, but this may help (and if I am wrong, I will benefit from the correction):

Spectrogram Graph

"The spectrogram is like a waterfall viewed from above, with the level indicated by colour."

As I understand it:

A flat-ish spectrogram is good: it means the system goes from sound-to-silence quickly.

Where you see a vertical streak on the spectrogram, there's some problem with the materials or geometry of the system which causes it to still be releasing sound energy after the input has gone.

This has 16 real world examples measured and discussed:

Audio Asylum Thread Printer
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Old 21st June 2021, 04:29 AM   #3
hollowboy is offline hollowboy  Australia
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Another example at the bottom of this article:

Voice Coil Spotlight: The Beryllium Advantage | audioXpress

Time and freq axes are flipped, relative to the prior example, otherwise same same.
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Old 21st June 2021, 06:58 AM   #4
fluid is offline fluid  Australia
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Change the settings to be something more like this then you will get a better view, it is a good time frequency view that makes it easy to see what is happening with different frequencies at different times.

Click the image to open in full size.

By changing the amount of time in the window and scale you will be able to change it to see more of the speaker or more of the room depending on what you are looking for.
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Old 21st June 2021, 05:32 PM   #5
mr ed is offline mr ed  United States
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Thank you for replies
I will give it another whirl and more than likely ask more questions
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Old 21st June 2021, 06:09 PM   #6
JohnPM is offline JohnPM  United Kingdom
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Looks like you may have loaded the mic calibration file as a soundcard calibration file as well (judging by the partial filenames on your screenshots). The mic cal should only be in the mic/meter cal slot.
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Old 22nd June 2021, 02:21 AM   #7
mr ed is offline mr ed  United States
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JohnPM
Thank you
Good catch.
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Last edited by mr ed; 22nd June 2021 at 02:35 AM.
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Old 22nd June 2021, 10:27 AM   #8
mr ed is offline mr ed  United States
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Hollowboy,
Excellent articles, I am still digesting and reading, but very good informative stuff.
You have helped teach me to fish instead of just feeding me.... ��
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