My guess is some sort of surround resonance. It showed up in my tests as well but not as a spike this tall. That's probably due to the smoothing I chose.I've had an interest an these for a while now, but that HUGE spike in distortion @ 3k concerns me. What's going on there?
I have been crossing at 3.13Khz or thereabout mostly due to CTC spacing requirements. That means the speaker should already be -3db down at that point. I couldn't tell you whether I hear the peak itself, I can't take it out and put it back in to know how it sounds like. The experience is more of the speaker as a whole. I suppose if I had a really well trained ear I could tell how 2nd order distortion at 3khz sounds like apart from the rest.Did you notice the spike at 3k with your ears? Didn't you end up crossing these over just under 3k?