Norbert...
You make a great point that has been touched on on another Thread here, of late. (http://www.audioheritage.org/vbullet...=&threadid=347 - an interesting mix of technical info and salesmanship...)
This might be of interest to some: http://www.crownaudio.com/pdf/amps/damping%20factor.pdf
Or, here's the .pdf for direct download.
I have no relationship with, nor do I own or use any Crown gear (but they articulate this real well )
I'm lately using QSC CX502 (LF) and CX302 (MF/HF) - each have damping factor "Greater than 500". The improvement over my prior rig-up is astonishing and largely attributable to (at least coincident with...) a materially increased damping factor.