You are probably better off sticking with your pre-amp and getting an active cross-over. This does depend on your speakers and how they are set up, but the best bi-amping works with an active cross over and the internal (speaker) cross over bipassed. With some speakers this is not possible (or very difficult). If your speaker will allow this option then I would suggest either the Bryston 10B crossover or the Marchand crossover. The active cross over gives you the ability to tailor the output of the high vs low pass, which can be a big plus if you ever go with different amplifiers for top and bottom end (not necessarily recommended--but it does leave you with that option). The other advantage is that the amplifier is driving the top and bottom end directly without another circuit in the way (since it has been handled at the line level). Hope that helps.
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