Since I have an EP500 which of course doesn't have the 'switch', it will be running in the flat range. I'll be teaming it up with the new 800 in the switchable controlling set up, I'll report on how it meshes with the standard EP500. I suspect it will be just fine as the 800 will probably do the heaving lifting and the 500 will be filling in things. It should be fun to see what happens with phasing and crossover points.