No, you can use the internal crossover of your loudspeakers if you wish.
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Johnymac...Ideally each amp would be connected directly to a driver (woofer or tweeter), completely bypassing the internal passive crossover. This is OK for the woofer, but the tweeter should be protected against inadvertent LF inputs by a series capacitor. You could try it this way.
It is possible that the internal crossover has some extra components (Zoebel network) to tame a resonance of the driver. In this case it might be best to use portions of the X/O circuit, jumpering out the HI/LO filtering parts that become unneeded with the electronic X/O.
I agree with El and Timo, but on different points. If you REALLY want to have a revelation, get rid of your internal crossover and go electronic. Passive bi-amping compared to active bi-amping with "direct drive" ( no passive crossovers between amp and drivers ) is kind of like the difference between bathing with your clothes on and off. One way works so much better, you'd have to be crazy to do the other once you experience the difference first hand. The difference in low level resolution, transparency and dynamics is eye / ear opening to say the least.
In order to do this and not run into problems, you'll need to contact the speaker manufacturer and get some help from them and / or find someone that can reverse engineer the crossover for you. As El mentioned, some speakers make use of notch filters, zobel networks, etc... Bypassing these would probably result in poorer performance, so you'd want to leave them in but get rid of the high pass and low pass sections. The more junk that you can pull out of the signal path between the amp and the drivers, the better off you'll be ( as a general rule ). Sean
sean....In general I agree with your comment about the superiority of driving speakers directly (not through X/O components), although I can think of a better analogy than the one you used.
Of course I biamp between my subwoofers and the MG1.6 mains, but I have considered also biamping the MG1.6. However, Maggies are a queer breed of driver, and I suspect that the crossover, although a very simple circuit, may be important to the overall speaker performance. So, I do not intend to biamp the MG1.6.
However, I am open to the idea of upgrading the passive crossover using same-value better quality parts, for example air-core inductors. In your extensive experience messing around with speakers, what have you learned relative to the benefits obtainable by passive X/O upgrade?