The coefficients from your calculator are: No Problem – I actually went away and came back to the problem, so it’s just resurfaced… But the plot thickens. I decided I probably needed to make a tool that let me play around in the s domain to figure out the interaction I wanted-left for when I have more time, or actually need such a shelf.įor the other filters, the only difference between Robert’s and mine are factoring (sin/cos instead of tan). I did some work on a more desirable Q control (one that doesn’t peak on the shelf), but didn’t completely work out the control details. Robert added a Q control, but it’s not a musically desirable one. It seems the only change is swap a for b, the signs look the same at a glance.Īs far as the shelves…I recall looking again, and concluding that Robert’s shelves and mine (after Zölzer) behaved the same. It depends on the browser, but for Safari, for instance, right click on the page and Inspect Element (maybe this needs the developer menu enabled?), and look at biquad2.js. OK, it’s looks like you’re doing the same thing I’m doing-take a look at the source of this page. Some keep the baseline corner constant (I’ve seen in before, don’t recall who-worst musical choice, in my opinion), with the boost corner moving, some define the frequency to be the center of the slope (Waves Q, Izotope Neutron EQ). My shelves keep the shelf frequencies constant (as does MOTU’s MW EQ I don’t know for sure, but I’d guess most analog shelving filters work this way too, as they’re often a lowpass with gain, summed with the direct signal), which means the top corner of a shelf boost will remain in the same place as you change gain, and the corner near the 0 dB baseline will move. If you have a lot of EQ plugins, play with the shapes of each-you’ll be surprised how many different ways they are implemented. Unlike lowpass and highpass, which have well-accepted definitions, there are many ways to define shelves. It’s closer at +13 dB, but there is no expectation that the response will be down 3 dB at the corner frequency. It’s the nature of a shelving filter, if you set the shelf to +3 dB, obviously it won’t drop 3 dB by the requested corner frequency because the slope is limited to 6 dB per octave. Without checking, that’s probably about right.
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