How to bi-amp speakers?

My receiver only has one pre-out per channel. Do I split this into two then connect to the inputs of the two amps I want to use for each speaker?

that would be how you would do it if you had a bi-ampable passive crossover other than that you need to get an active crossover and put it between the receiver and amps

Yeah going out to an active crossover is the way to do it right. Just remember to bypass any passive crossovers.