Just out of curiosity - when using a pedal like Broughton's HPF+LPF, if you set the LPF at the 20k setting, wouldn't that pretty much be like it wasn't there at all, regarding high frequencies?
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Just out of curiosity - when using a pedal like Broughton's HPF+LPF, if you set the LPF at the 20k setting, wouldn't that pretty much be like it wasn't there at all, regarding high frequencies?
Yes.
But at 60hz, on paper it will be on a slope that is 3dB down, it isn’t a brick wall. Use your ears to dial in what sounds or performs the best.
Yes, as you said pretty much.
Component tolerances factor into settings. Setting the LPF at the maximum could still potentially limit harmonics. These hamonics can not be heard but they can affect the “quality” or “high end sparkle” of the sound. Or so studies claim.
But let’s not over think this. Use the LPF set to max and enjoy it.
I don’t know if there is a magic answer. Quality matters.
In recording, high and low pass filters are used to cut holes in the landscape for sounds to reside and not overlap one another.
Slope. Generally graphic EQ have a very shallow slope whereas a dedicated HPF or LPF has a much steeper slope.
Allows you to use so much more of the whole spectrum up to the cutoff frequency.
A Fender bass is not the same as a Gibson bass. Both are basses but they perform differently. The same applies to filters, they also perform differently depending on the design and components. A studio filter is not usually the same as a foot pedal based one.
HPF and LPF are generic terms, it’s what’s behind it that counts and sets it apart from a generic EQ.
HPF and LPF are generic terms, it’s what’s behind it that counts and sets it apart from a generic EQ.
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I also assume that the lowest and highest sliders on the graphic EQ are shelving style, and so affect the lowest and highest frequencies differently than a typical HPF or LPF would.
- Feb 12, 2006
- 60,978
- 5
- 220,734
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Probably not shelving? So peak then? (is that what it's called?)
They are all supposed to be “Constant Q” which is their form of a peak filter. The way their manual describes it, it seems that instead of a bell shape, the sides are more vertical.
- Feb 12, 2006
- 60,978
- 5
- 220,734
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Constant Q is simply a filter type where the Q is (more or less) constant at different boost/cut levels. They are all peak-dip type filters.
- Feb 12, 2006
- 60,978
- 5
- 220,734
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
If you do the math, that's exactly what I said. What your picture shows is what happens when you combine 2 filters at full boost with 1 band of separation between them, which was a supposed selling point. In practice, this application is rarely beneficial because that's not how a graphic eq is used. Myself, I do not care for constant Q eq's in PA applications.
