I have looked around at a couple of datasheets for some audio-based op amps. They seem to have a linearly decreasing gain with (logarithmic) frequency over the human hearing range. And it puzzles me a bit, because isn't (good) gain supposed to stay at a constant value for all frequencies of concern? I looked at several such op amps and they have similar curves. So am I missing/forgetting something here? Is it good to have linearly-decreasing gain over frequency? Why?
(e.g. I checked AD823, LM4562, OPA2134)
(e.g. I checked AD823, LM4562, OPA2134)