Help needed Rowe CD-51 jukebox
 

Trying to figure out the speaker wiring for the left and right up on the terminal strip. I have 1 red, 1 purple and only 1 black up there. Someone wrote in pencil that for the left channel purple to E7, black to E4 and red to E1. For the right channel red to E4 and black to E1. Any ideas? Thanks!