If your ears can't do it, use your eyes and get yourself a spectrum analyzer (If you use PC VST, I personally recommend the free Voxengo SPAN,
which is available here).
An example how to do it in Cubase (would use pictures, but I don't have any projects at hand) edit: I did
a picture with no data, hope it helps.
* Create a new stereobus called "Spectrum Analyzer" with child busses (Devices > VST connections, choose GROUP/FX tab, click "Add Group", choose stereo and press "OK", right click on the new bus and choose "Add all mono child bus", close window)
* Put the SPAN as an insert to the group channel, open SPAN and input these parameters: Peak Hold to "Inf", Blocksize to "16384", Channel to "L+R"
* Send the kick to the left spectrum analyzer bus channel and the bass to the right
* Press play and go get yourself a nice cup of coffee. Let it roll for ~30-xxx seconds and press stop. (you can do this with two instances of SPAN, but I prefer to do it this way because the side-by-side comparsion is easier)
* Compare where the frequencies collide and concentrate on the values below 300hz.
* Use EQ to give space to both of them. I personally prefer to boost the kick at 40-60hz (alot), cut at ~125hz and highpass at 35hz after them on a different plugin. on the bass I usually boost at the highest peak (usually between 90-120hz), cut at 200-350hz where the mud is and highpass at 50-70hz
And highpass EVERYTHING ELSE at 80-120hz, because there really doesn't need to be anything else at the bass frequency range (except maybe for synth, cello, sub drop bombs and other bass orientated instruments), this gives a lot of room for the kick & bass and usually gives you quite a lot more clarity on the overall mix.
et silleen!
edit: I actually
listened to the clip of yours, I must say that you should consider boosting the snap of the kick (maybe a peak or two at 1k-5k and highshelf boost above 8k?), also try out
FaderWear paraller compression guide on the kick and snare
