I apparently fried my Yamaha R-S201 receiver by attaching 4 Bose 151 4ohm speakers to the system; 2 on the A side and 2 on the B side. My question is if I buy another receiver that requires minimum 8ohm can I attach all four speakers to either A or B to gain needed ohms; 2 speakers on left and 2 speakers on right? Did not know the ohms made a difference