Well, imagine how wonderful it would be to accidentally disable your crossover entirely at full blast say...to your tweeters //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Full range = blammo to the poor tweets. I wouldn't like to see what would happen to my mids if i tried to suddenly send them full range at high volume levels either...they like being crossed over //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
Digitally adjusting the slope or x-over point on your deck shouldn't hurt the speakers as long as you don't accidentally adjust them too far...