One thing to note about the NRC plots. I asked Ian about the low frequency performance of NRC's chamber and he said he doesn't believe it's accurate below 150Hz. Ian calibrates the low frequency measurements from Axiom's chamber on a per model basis using corrections derived in a 4pi environment.
I also asked about the high frequency behavior of the impedance curve which didn't look right to me. He said that could be the result of tweeter ferrofluid that wasn't up to temperature. I found that very interesting because those of you who have read my posts on here for the last 11 years know I've frequently observed my sound varying with temperature and couldn't put my finger on why.
As for the reported sensitivity, I don't know why that might be. It's 3dB lower than Axiom's spec.
I haven't heard the M5HP either, I know it's gonna sound great and I will eventually buy a pair once I make some room adjustments.
