Buy an electronic crossover. Connect the pre-amp to crossover and low out put to subwoofer(s) and high outputs to speaker amps. If your sub has low level inputs (ie from pre-amp) it should alo have low level outputs that go speaker amps. I suggest strongly that you do not bi-amp by connecting pre-amp to 2 sets amps w/o x-over. The sub -woofer will try to produce high frequecies which it can't except enough to muddy your sound by causing wave cancellation. The intro of a cross-over will be startling in terms of clarity. Cross-overs are hard to find. You can buy a kit from www.marchandelec.comm for $250. Pro-sound guys are big on cross-overs and DBX makes a good one.
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