John, hi. I have the impedances of four drivers connected in parallel to a signal source. Using trace arithmetic to find out their total impedance. But it is difficult. There are 17 mathematical operations to be done, as I calculated. If A,B,C,D are impedances, then A*B*C*D/(A*C*D+B*C*D+A*B*C+A*B*D) is needed. Is there an easier way to do my task with REW?