Help Will CJ Premier 11 enough power for B&W 804?

Do you think that the 70 watts will be enough for the Nautilus 804's
Depends on your volume level requirements and the efficiency of your speakers. I did drive a pair of Thiel 3.6's with a Premier 11a for a while before moving to a CJ MF2500A. The bass response was more defined with the 2500A,however, I was very satisfied with the mid to high end detail of the 11a. So you will have to be the judge. You are going to, in all likely hood, suffer in the bass response.
804's should be a lot easier to drive than Thiels. Not to knock thiels awesome sound but, they are amp destroyers.