I have a 7.1 preamp,is there a 7.1 dvd player?

Not yet. But you can split the rear channels and send them to both rear and sides.

There are 7.1 DVDs but only through the digital outs.

They are actually 6.1 Unsound but they are the reason receivers converted to 6.1 with a rear center. Almost all receivers are now using 7.1 and creating stereo rear centers or back surrounds. Of course some have even more channels but they are simulated at this point.

Hook up all of the speakers and let the Classe simulate 7.1.