Pass Labs XA30.8

All, 

Do you think Pass Labs XA30.8 has enough power to drive 86 dBL Dynaudio focus 380 speaker well? My room size is 23'x18'x8' and I sit about 8' away from the speakers. Usual loudness is about 50 to 67 dBL when measured with noise meter app using my phone.

Also, what sonic improvement will I hear going from Bryston 4B Cube to XA30.8? 

Thanks.