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Author Topic: Shelf filter slope?  (Read 2064 times)

ppataki

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Shelf filter slope?
« on: March 15, 2017, 09:13:32 am »

Hello,

I would like to know what the slope setting is (dB/octave) for the high shelf and low shelf filters of the Parametric EQ
I can change the frequency, the Q and the dB and the channels but I cannot see the slope setting
Thank you
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mattkhan

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Re: Shelf filter slope?
« Reply #1 on: March 15, 2017, 09:25:54 am »

you can calculate S from Q as per https://yabb.jriver.com/interact/index.php/topic,99096.msg686082.html#msg686082

solving for S gives you

Code: [Select]
S = 1/((((1/Q)^2-2)/((10^(d/40))+1/(10^(d/40))))+1)
there isn't a straight mapping to 1st order or 2nd order so you can use a loopback or the minidsp spreadsheet to visualise what the resulting slope actually looks like
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ppataki

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Re: Shelf filter slope?
« Reply #2 on: March 15, 2017, 10:01:50 am »

Thank you!
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ppataki

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Re: Shelf filter slope?
« Reply #3 on: March 15, 2017, 10:02:29 am »

A visualization in JRiver would be great to see these filters in action though
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Matt

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Re: Shelf filter slope?
« Reply #4 on: March 15, 2017, 10:03:59 am »

A visualization in JRiver would be great to see these filters in action though

Analyzer in DSP Studio should do a pretty good job.

You can use Tools > Advanced Tools > Audio Calibration to play things like pink noise.
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Matt Ashland, JRiver Media Center

drmimosa

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Re: Shelf filter slope?
« Reply #5 on: March 16, 2017, 12:59:47 pm »

A visualization in JRiver would be great to see these filters in action though
+1

It's hard/impossible to see small notch filters in the pink noise visualizer.
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