with headphones, I usually prefer the sense of depth and separation offered by slow filters over the relative 'in your face' aggressiveness of sharp filters. Interesting that many people consider sharp filters to be superior. There are still a few aspects of this that I don't quite understand yet but I'm getting there.
This is a very clear explanation of FIR design and window functions, plus it demonstrates the custom filter designer for MATLAB/octave referenced earlier. I'm not sure I agree with all of his opinions or interpretations (difficult for most, if not all, to hear? it's simple if you know what to listen for.), but otherwise it's a great explanation. These posts demonstrate the trade-offs in oversampling filters.
Here are some additional resources I've found helpful for following along with this discussion, for anyone else who is curious:ĭAC Digital Filters and their impact in the time and frequency domainsĭAC Digital Filters part 2: Deeper dive into the AK4490 and AK4493 filters
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