Bass is clearer and more impactful when I stand vs. when I sit

Yup, nodes.  I had a nasty one around 300hz.  Same thing, could hear it standing up but not seated.

Move your speakers around.  Experiment.  Move them closer to the walls, then further.  Move thrm up and down if possible.  Different stands for temporary testing might be good.  Use chairs or whatever else that you can use as trmporary stands.


Move your listening position around if possible.

I went from being -6db from 30hz all the way to 200hz to 0db to +3db from 28hz to 200hz just by different height stands and speaker placement.

Thank you everyone for your input!

I will try positioning both speakers and chair. May be I will try with chairs first because the speakers are 60k/each, which is too heavy for me. 

@asctim: I'm not using a subwoofer. 

If you need to move your speakers use furniture moving pads appropriate for your floor that allows you to slide them more easily.  After you find the best spot then you can obsess about spikes and such.

+1jc

big changes happen to your frequency response just by moving your speakers.

changes imaging, soundstage and frequency response big time

I'm surprised no one mentioned room treatments specifically? It sounds like a null like others have said and I completely agree with experimenting with seat and speaker position. Just adding that room treatment for bass control might be helpful as well. Depending on how far the front baffle of your speaker is from the front wall certain frequencies will be reflected back to you when the frequency range goes into modal territory. This is SBIR. If your speaker is further from the wall this will become more difficult to treat as the reflected waves are lower frequency. Maybe you could try moving the speaker closer to the wall. Otherwise you may want to get bass traps for the front wall or 3 to 4 inch thick panels. You could also treat corners with bass traps but those are large and get ugly if your space is small.