How to Bi-amp??

Your preamp would need to have dual outputs on it, if it doesnt have dual outputs, then a "Y" connector could be purchased for very little money.

You of course, would also need another pair of speaker cables for one of the amps. Dont forget about IC'S as another pair of those would also be needed.

If I have left out something, I'm sure others will respond to this and help you out.

Riley804 is right on. But if you're preamp doesn't have two sets of outputs, using a cheap Y-connector will decrease transparency. You may end up driving the speakers better, but you may also add distortion.

I also recommend utilizing the identical interconnects and speakers cable for both amps to achieve the most cohesive sound.

I guess I should of included, I have a Audio Research SP9 MKII preamp, I beleieve I just have a main output.
This was just a thought. I hate to use a cheap Y connector. Thanks for the replies!!

I am also in the planning stages to bi-amp, here's what I've come up with so far. I will be getting a Behringer digital crossover to bypass the ones in the speaker. So, it's source to pre-amp, then to crossover, then to the power amps (there's also one more output to include a subwoofer). You can use any speaker wires that you fancy, but you will need more interconnects for the extra hookups.
Just curious, to switch gears a bit, how do you like your Consonance CD player? I bought one, and I think it's great!
Sonny