That is one of the best mixing tips I learned .. 2-4kHz is extremely important on bass drum and bass guitar.

It's one of those crowded zones where a little less of a certain frequency on one instrument cleans up the other.
And that frequency range is really important to both bass drum and bass guitar for definition or character or whatever your term is.

More 2kHz on bass drum may be better, or even vice versa, but it's something to always look at.
I noted this years ago and keep it as one of my important lessons on mixing.

Guitar & vocals (as well as others) use this range, but not as importantly as the bass & bass drum using it as efficiently as possible. That's the challenge; you need them both to be defined in a range that is already full, so define them more, don't let them clutter/compete ..

/it's an art, there are no rules, but lessons/notes are OK


I do not work here, but the benefits are still awesome
Make your sound your own!