From what I've heard before, both bi-amping and bi-wiring typically (with a few special exceptions) still rely on the speaker's crossovers. What it's doing more than anything else is separating the high frequency and low frequency signals at the speaker cable. Here is a page I found in a quick Google search that looks at one explanation of why there are benefits to using bi-wiring (or bi-amping). (Edit: for what it's worth, here is another link. Neither link strikes me as being the most satisfying information source, but they are at least a start.)

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review

[This message has been edited by gonk (edited June 13, 2002).]