Carp, thank you for the hard work to deliver for us.
There are some interesting things to see here. I don't know anything about your system, but we can tell from these, they are 212s.
What resolution is this? 1/12th?
Did you rotate the horn 90 degrees when you changed from horizontal to vertical or vice versa?
Are you using any room correction?
If not, do you have it available and just turned off?
If you do have a room correction utility, what is it?
I'm no engineer, but I'm used to looking at RTAs a bit. I'm only referring to the center channel on-axis graphs...but the first thing I notice is that the response above the crossover is fairly consistent. I wouldn't call it smooth, but...how much can we really tell and judge? I'm sure your room is real world, not a lab.
What really gets my attention is how diffferent the response looks below the crossover, especially the two octaves below (100 Hz to 400 Hz). Not sure what it means, but I'd like to learn.
Ok, LTD02, can you tell us anything from these?