I don't have much experience with these, but I'm getting some pretty muddy sounding bass with my stereo monitor setup. I did a quick and dirty waterfall with FuzzMeasure and the laptop's built in microphone (don't have my measurement mic with me unfortunately). The two big peaks are at about 116 Hz and 174 Hz. I assume the long decays mean I have room modes? I played tones at those two frequencies, and I can't hear or feel anything resonating, but when I walk around the room I can easily find nulls where I can hardly hear the tones.
The room has a vaulted ceiling as you can see. Behind the camera in the picture, the vaulted ceiling drops down to 8' flat for the kitchen. The living room is 14' deep with the vault, then the kitchen area is 10' deep.
So my guess is this is being caused by my vaulted ceiling? The ceiling is about 79" above the speakers, so does that correspond to the 174 Hz mode? I know I'm almost centered right under the peak of the vault, so I'm not sure if that's the best or worst place to be in the room.
P.S. I'm new here so hopefully this is in the right place. The S in AVS stands for science right, so you guys like this kind of data and analysis right?