F3 suitability

I have an F3 on loan. A few questions arise:

1. can I safely drive only one channel of the amp (for a/b comparison purposes, L channel my old amp, R channel F3)?
2. how suitable is F3 for 12ohm horn 112db tweeter (bi-amp config, active crossover at 2kHz)?
3. how suitable is F3 for mid+tweeter horns combo (series-passive crossover, 12ohm tweeter, 16ohm midrange)? Midrange will play down to 250Hz.
4. in both above scenarios about how much power will I get from F3?

Thank you,