Having owned Revel Salons, which have the same configuration as the Studios, to biamp the speakers all you really need to do is hook your preamp to two different stereo amplifiers, remove the jumpers between the speaker terminals on the back of the speakers, then run one set of speaker leads to the bass, and run the other set of speaker leads to the mid/treble terminals. You could use one stereo amplifier per speaker: right channel for the bass and left channel for the mid treble if you have matching amps. If you have differnt amps, use one amp's right and left terminals for the bass and one amp's terminals for the mid/treble. Do not disable the internal crossover! The proper use for your Rane Crossover is to purchase a subwoofer or subwoofers like the JL Audio, cross the Studios over at about 80 hertz so that the subs do the lowest bass, and your other pair of amps do the upper bass, midrange and treble. You can have outstanding results this way but it will require lots of tweaking. The reason I'd recommend the JL Audio subs like the f-113s is that they have built in software that will find the areas in your setup that need bass reinforcement and attenuate themselves. The only way I no to get better sound would be to have a professional with test equipment set up the subs.
You could also get great results with the Velodyne subs.
Let me know if you need more info.
Vertically or horizontally biamping the Studios can bring exiciting results and is recommneded by Kevin Voecks who I've spoken to several times. Kevin would also endorse the inclusion of subs I believe as he helped me attaint the highest level I ever brought my system to in this way.
You will enjoy this setup more if you use identical amps, speaker wires, interconnects, isolation,etc.
Hope this helps,