Question About Mixing: Using Filters and Shelves

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Hey friends. First off, I just wanna say how much I appreciate all the kind and helpful folks on this website. I'm a bit new to mixing on digital, I'm getting the hang of things, but I have a concern about how to properly use high/low pass filters and shelves. In particular, where people talk about using a low shelf or high pass filter and cut below, say, 100hz, I imagine the eq curve beginning it's decline at 100hz. However, if you set the eq with a low shelf or high pass filter at 100hz numerically, it is beginning it's decline well before 100hz, at 200hz or more. Could someone explain this to me? I realize this may be silly, but it would help me out of some confusion if someone could explain this to me. As I am mixing in an untreated room with small monitors I like to have perspective on everything I do to help as a guide where more precision may be wanted. As a rule, I am mainly interested in a basic mixing approach, and I don't like to eq where it is not really necessary, as the last thing I would want to do is over-mix or do too much where it serves to suck out perfectly worthy parts of individual sounds(just what I am interested in, though of course it depends on the other tracks too). But the second last thing I wouldn't want to do is mix too little ha. An answer to the above question would help me a lot, as I feel fairly comfortable with parametric eqs, but unsure of myself with how to most effectively use filters and shelves. In the middle of mixing fever so thanks so much for any advice!
 
I think what's happening is you're seeing the dif between set freq and actual beginning of the slope. That would be due to 'defining the set freq at the point of a certain amount of its reduction, the -3db point if I'm not mistaken.
I noticed the PSP's Noble Q' which is a 'Pultec emulation if I'm not mistaken, the HP filter set at 60 for example seems to effect way up above that. I didn't notice it right off, but it became quite evident on mix- go figure. This was much than I'd expect to be explained of just some 3db down point'. So, there could be well more to this than just that.
It'll be interesting to see what some of the more learned around chime in.
 
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