Speaker ohms

I have an Onkyo TX-8050 receiver with Bose 151 outdoor 4 Ohm speakers on the speaker "A" connections for outside patio use. The TX-8050 impedance is set at 4 Ohms for the outside speakers. I want to add Definitive ProMonitor 800 speakers (8 Ohm speakers) to the "B" connections on the receiver...