Agreed... but I'm seeing two different discussions here -- one talking about 4 pairs of speakers and another talking about 2 pairs of speakers. Two pairs is no problem using the A and B ports, but four pairs is a problem unless series resistors are added (but this idea seemed to be rejected because of losses).

Do you think we are talking about 2 pairs or 4 pairs as the requirement ?

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8