Now THAT looks a little better! Glad to see you found the problem. What was it?Here are new baseline measurements.
However, I'm really curious about your sound card: the calibration curve you show in your graph (above) is clearly showing feedback, so it is not valid. Yet the one in the file on DropBox does not show that. But it DOES show ringing in the high end, and it's different from the soundcard calibration from yesterday. The ringing is not huge, but it is significant if you want precision.
OK, on to the actual data: There's a difference between your left and right speakers. I'm not sure if that is the speakers themselves, or the room. I'd suggest moving the mic in a bit closer to each speaker individually, putting it on-axis at a distance of one meter from the front baffle, and pointing directly at the speaker. Compare those graphs. Also trey something a bit closer (say 50cm) and something a bit further back (say 150 cm) and compare. That should give a good indication of where the problem lies.
Next, what treatment did you have in the room for this test? Clearly, it is not empty of all treatment: There's some treatment going on. But it would be good to know exactly what you had in there. Is it according to the diagram you posted above?
I'm curious about the room design concept: Is it based on CID? That's what it looks like.
There's a few rather strong early reflections that you'll need to deal with, coming in at about 3.5ms, 6ms and 9ms after the direct sound. You can use the "string trick" to track down those, but the prime suspects would be ceiling, floor, and walls.
Decay: The room is too live: For that sized room, you should have decay times of about 200 to 250 ms, give or take, but you are up around 360 right now. So more absorption is needed, but controlled carefully, to keep the decay times consistent across the board.
The big issue, of course, is the massive mode at around 29 Hz. That's predicted: it's your 1.0.0 mode (fundamental axial length mode), of course. Always the toughest one to deal with. There's also something at around 41, which is harder to explain, as there's no mode predicted around there. There's also something at around 66, which I'm guessing is your first height mode, but I don't recall what the height of the room is, so I can't be sure.
The next biggest issue is the large dip at 82 Hz, which might be SBIR, but we'll need your new "walking mic" test to figure that one out.
There's plenty of other stuff too that will need dealing with, but the overall conclusion is: you need a lot more bass trapping for the very low end, while taking care not to suck out the mids and highs with that, and also adding some controlled mid and high absorption, to get the overall decay times down, and even. You also need to deal with the early reflections, and the possible SBIR issue.
But DAMN thos speakers are performing nicely! Getting down to about 26 Hz with negligible distortion and fairly flat response, is pretty amazing! I'm jealous!
- Stuart -