How important is impedence matching?

I just mated a pass x-350 with my sonic frontiers line-3 and some tubes went bad within a day. Maybe its just coincidence, but its got me wondering about impedence matching. The balanced output impedence of the line-3 is 90 ohms and the balanced input impedence of the x-350 is 22k ohms. I guess my question is will improper impedence matching cause problems? and what are the parameters to go by?