Likely my misunderstanding!
Thanks for circling back. I’ll put it another way. Having established that a HP or LP resulting from a SVF tap or permutation can perform the same job as a buffered single pole (when fed into an inverting input of a cut or boost amp), I was saying that the next step was to evaluate the relative complexities and advantages of keeping the SVF for shelving, or swapping in a buffered single pole. The one condition being that the SVF Q has to be set the same as (or lower than) the single pole buffered Q.
There is a real beauty and professionalism (I feel) in working without shelves entirely. You obv have to have a low Q setting, .4 or .5, available easily on the bell. In developing an all-round console parametric that will be fast, accessible, and function very similarly across mono and stereo/dual mono models, I’ve wrestled with whether to include shelves at all. It’s simpler not to - less parts. Harder to overload the low end, certainly. But the single biggest catch is that we’re all SO used to using shelves that a designer would be shooting themselves in the foot to not include them. Me, I like the straightforwardness of these designs, where the unit screams “that’s what the wide bandwidth setting is there for” instead of “here’s a shelf.”
Not necessarily. There are some examples of 2nd-order shelf EQ.
My life has been crazy, so I'm just catching up with this thread. Re-read it several times.
Wow, comprehensive low impedance design in both the cascade and SVF sections; I like that. 1981 is pretty early for this sort of approach, pushing the 5532 and 5534 down to their drive limits… Anybody got a frontpanel pic? Looks like a strip’s dynamics/eq section.
Yeah that’s the same NetEQ mix topology. Cool circuit, all killer no filler. Maybe the wide separation between the bands helps with the no interaction aspect.
Paul Gold of Salt Mastering (who’s on here somewhere but I don’t know his user name) was talking for a while in the mid-teens about developing an all-shelving eq, two lows and two highs. That sort of reinforced my idea of using a four-band Net EQ topology and having the two lows and two highs both shelve. I’m sure it’s been done before. The EQ Olympics would be if one switch changed all four bands from bell to shelf, with no opportunity to change just one.
You're right. My mistake. I stand corrected.
As someone else said, it's for a positive center point.
