Yes, the N303D can be connected. According to the manual, speakers with 8Ohms and more are recommended. The B&W 684 S2 have 8Ohms. The amplifier power also matches B&W's recommendations.
Connecting the speakers is described on page 11 of the manual (see Digitec product page of the R-N303D). Bi-wiring is also possible, if desired.

Sorry, I have 2 old B&W speakers. Unfortunately, I don't know the 684 S2.