Infinity Epsilon

I have a pair of infinity Epsilon speakers which were not in operation for a long time. I started to use them again with Accuphase P500L driving low and Accuphase A50v driving mid and high. In order to avoid damage to speaker and amps I must to set  the adjust key on the servo control unit either on   0 or 180 phase  (control key on the back of servo control ) . I do not know  which position ( 0 or 180 ) should i set this key since any wrong selection would create a dreadful noise on the speakers and will damage both the amp and speaker !! ? Any suggestion or recommendation to help me ? Thanks