external crossover when bi amping?

Most all speakers have a x-over within. It controls what goes to what and cut-off points.If you biamp with different amps the internal x-over must be removed from the equasion.-The output of the amps will be different. The volumes won't match.---Biamping with 2 of the same amps allows you to still use the internal x-over.

George: "If you biamp with different amps the internal x-over must be removed from the equasion (sic)."

Absolutely not correct. Biamping with the existing passsive crossovers--and 2 identical amps--is the easiest way to do it. Even if the amps aren't identical in gain/sensitivity, it's STILL the easiest way to biamp, as one merely needs a gain control on the more-sensitive amp. Using the passive crossovers also retains all the impedance-correction and other equalization networks the speaker designer worked perhaps very hard to perfect.

Ner...:
1. An external crossover is NOT needed when biamping.
2. Don't quite know how to answer this. Perhaps all the other info here will answer it for you.
3. The same way it works when you feed it with one amp and one or 2 cables.

Biamping can be very complex and difficult to perfect. SOMETIMES it brings fine results. I suggest you start with biwiring--you'll need it anyway if you decide to biamp.

BTW, it's 'biamplify' or 'biamp' and not 'bi amp' or 'bi-amp'.
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Perhaps some further explanation is needed here. If you have a two way speaker with one pair of binding posts and an internal crossover, of course, then I don't see any other way of biamping than to disconnect the tweeter and the woofer from the crossover and then connect each directly to an amp. How else can you get one channel to go directly to the tweeter and the other channel to the woofer if everything is still going through the original inputs? I have always thought that the purpose of biamping was two fold:
1. to place the crossover before the amps, and
2. to give each driver it's own power source.
Which means, you would need an external crossover.
Are we confusing biwiring with biamping?
Sonny