akiz wrote:My exception: When you go down, bass is warm and prominent even if you dont add resonance. If you ever tried valve filter you will know what i mean

Be warned, pointless digression below:
I sincerely doubt our ears can be tricked to hear that kind of warmness with digital signal processing. Let alone doing it with just a simple low pass filter.
To me we have different flavours of sound. The expensive warm sound and the cheap digital/software one (which doesn't need to be dull).
You can achieve different timbres with each, and each has its subtleties, but in the end what matters is the form in which you shape your sounds. I mean the dynamic range, the frequency content, if it's got more 2nd or 3rd harmonics, etc.
In my way of viewing it, despite the [big] differences, the importance lays on the musical content to be conveyed. As soon as the mix is crowded with 2 or more timbres, the warmness of the low end becomes relative to the rest of the music.
All this is kind of my excuse for using linux on audio: I know there are probably much better compressors, filters, recorders, etc out there in the propetary realm, but one only needs a basic set of tools (with as low a resource usage as possible) with which to build one's sound.
Each time you workaround a limitation or patch a hole in your setup, you are shaping the output in a very particular way. The limitations become as defining as the possibilities. I guess that's something to keep in mind when working with a cold computer.