NewYorkDave
Well-known member
I've been farting around with various values of reactive elements in my EQ circuit, and it's occurred to me that for the high and low bands, it would probably be most useful to have a peaking response when boosting and a shelving response when cutting. My reasoning is that when you're boosting treble or bass, you usually don't want to boost out-of-band noise as well. So that seems to call for a peaking response. On the other hand, shelving response is what you want 99% of the time when you're cutting at the ends of the band. So it seems a combination response would yield the most useful EQ with the fewest controls. (I'd like to avoid having a bunch of "peak/shelf" switches in addition to the level and frequency controls, if I could).
Whatta you think?
Oh, by the way, it's not a new idea. Here are the curves of the circa-1961 Langevin EQ-251A:
Curves
The LF curves are shelving, but the HF curves are a combination as described above. The classic Cinema Engineering EQ used a similar circuit and a similar set of curves. (I believe both designs are due to Art Davis).
Whatta you think?
Oh, by the way, it's not a new idea. Here are the curves of the circa-1961 Langevin EQ-251A:
Curves
The LF curves are shelving, but the HF curves are a combination as described above. The classic Cinema Engineering EQ used a similar circuit and a similar set of curves. (I believe both designs are due to Art Davis).