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RE: Active bi-amping of ET LFT-8b

In this case the acoustic crossover is quite a bit higher than the electrical HP filter. He's using the natural roll-off of the midrange driver to form most of the crossover. The low-frequency filter is more about protection than crossover function. It's an "interesting" design that is not nearly as simple as it looks.

In your case, it seems your intent is to match a completely different woofer setup to the system. So, I think it's up to you to implement it however you see fit. However, I think your woofer system should have viable response for the entire bottom decade (20Hz-200Hz) of the audio band. In fact, a bit higher than that would be preferable.

Dave.

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