I was assuming @1m , but can convert from most any distance.
I'm just curious (withing the frequency range it's given) what the max SPL of the mid-range is. I can get an idea by power-handling and efficiency (which are easily available), but I know (at least in my expriments with LF) that mechanical clipping can kick in on at least some drivers while still within handleable power.
Didn't know if you had that data available. If not: no biggie