Mcintosh MA5100 speaker connection

Finally got a Mac, the MA5100. Im not familiar with the vintage gear, so my question is; the rear panel speaker terminals have 8 screws for each channel. from what I understand, the two center, and inside screws are used for stereo connections, the top being +, and lower being common (-). Am I correct in my assumption?

left X X Right X X
X + + X
X - - X
X X X X