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Post by Hexspa on Feb 24, 2020 17:36:47 GMT
Looks good. You have some ringing from 100-200Hz and a small region from 200-300Hz. That should be easily fixable with some more broadband.
EDIT: Then again, maybe you don't. It's easier if you use the sliders in REW and analyze for yourself. The decay plot with 140 and 160ms selected should also help. To tell you the truth, I'm not sure why we use waterfall and not decay anyway.
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erion
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Post by erion on Feb 24, 2020 20:30:22 GMT
Looks good. You have some ringing from 100-200Hz and a small region from 200-300Hz. That should be easily fixable with some more broadband.
EDIT: Then again, maybe you don't. It's easier if you use the sliders in REW and analyze for yourself. The decay plot with 140 and 160ms selected should also help. To tell you the truth, I'm not sure why we use waterfall and not decay anyway.
you meant this? : Attachments:
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Post by Hexspa on Feb 26, 2020 19:05:37 GMT
Ya but can you scroll down so we can see the entire line? It's not 20dB from the highest peak to the lowest, it's the difference at each frequency. If you have a null at 150Hz, say, then you need to show down 20dB from there. You also need to show the original line and compare from there. Look between 140 and 160ms to determine the difference from the instantaneous SPL. That's the one that says 'Feb 19'
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erion
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Post by erion on Feb 29, 2020 19:45:59 GMT
sorry as im new with rew and im trying to understand it day by day..is this what you were asking? Attachments:
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Post by Hexspa on Feb 29, 2020 20:26:13 GMT
Yep. Figure out where that 150Hz null is coming from and you're good. That SPL isn't smoothed, right?
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erion
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Post by erion on Feb 29, 2020 20:58:51 GMT
Yep. Figure out where that 150Hz null is coming from and you're good. That SPL isn't smoothed, right? Smoothing says at 1/48 , I don’t know how much smoothed it is but when presing other settings it got way to smoothed! How do i find what is causing that null? |
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Post by Hexspa on Feb 29, 2020 21:13:13 GMT
Figure out what's 1/4, 3/4, or 5/4 the 150Hz wavelength from your speaker. Either that or adjust your cloud gap smaller - that's what worked for me.
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erion
New Member
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Post by erion on Feb 29, 2020 21:30:35 GMT
Figure out what's 1/4, 3/4, or 5/4 the 150Hz wavelength from your speaker. Either that or adjust your cloud gap smaller - that's what worked for me. the null is centered at 136hz and calculater says that 1/4 of the 136hz is 21 inches and 3/4 is 65 inches if understand correct! Now what are these numbers telling me? |
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Post by Hexspa on Feb 29, 2020 23:22:56 GMT
There's probably a boundary there. Absorption 'removes the wall' as it were so find that distance and put a thick panel there. That should do it - just remember that both speakers are probably affected.
The other possibility is that there's a boundary that distance from the mic. That's called Listener-Boundary Interference Response. Either or both are possible. It may be your desk in which case you might want to dampen it or use a mesh top piece as I plan to do.
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