That is a special case where such a measurement is not possible. I am able to measure the tweeter if it is separate from the woofer. THen I can put the mic close to it and isolate it from the impact of the bass driver. When the speaker is coaxial, I can't do this. Any such measurement would be full range and show both drivers.I'm thinking of the KEF LS50 Meta review and a few others I can't name off the top of my head where I couldn't see the tweeter/woofer measurements separately.