Usher BE-20 nominal impendance ?

Hi all,
I'm ready for a used pair of BE-20 and wonder what is the nominal impendance value? Usher web said 8 ohms - all other reviews listed as 4 ohms
I plan to drive these with Cary 805C 50wpc, not sure if it has enough juice ?
Not enough power. Go with a McIntosh amp like the MC402, you will be very happy.
Directly from Paul at Usher not usher/usa he states nominal impedance is 4 ohms. The impedance curve has most of the curve at 4 ohms.