Higher frequencies will in no way dammage the sub! Your problem would be deep bass going to smaller drivers, or lower frequencies not being handled well by smaller drivers. But in your case, you'd never have such problems, even if feeding it a full range signal! If in doubt about crossover frequency of processors "sub-out", just call the manufacturer! Also, consult either Revel or the manual for specs and features. Not a big deal really...
Good luck
Good luck