I think these are anechoic or simulated anechoic (time-gated spliced with close-miked) measurements, but don't know for sure. Click on "Measurements", on the right-hand side:
http://www.klein-hummel.com/klein-hummel/icm_en.nsf/root/prof-monitoring_studio-monitors_main-monitors_O500C#
Duke
dealer/manufacturer
http://www.klein-hummel.com/klein-hummel/icm_en.nsf/root/prof-monitoring_studio-monitors_main-monitors_O500C#
Duke
dealer/manufacturer