Correct me if I'm wrong, everyone, but I believe the way to hook up the two speakers correctly to one output is to do them in series. You'll need 3 separate speaker wires:
  • One to go between the red terminal on your receiver and the red terminal on the first M2.
  • One to go between the black terminal on first M2 and the red terminal on the second M2.
  • One to go between the black terminal on the second M2 and the black terminal on the receiver.