Yeah... normal (not biamped) operation is to amplify everything and then use a passive crossover in the speaker to separate out the frequency ranges. For effective biamping you put the crossover before the amps, so one amp only amplifies low frequencies and the other only amplifies high frequencies.

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