I have 2 Kilomax Pro 18 subs that I need to power. They are rated at RMS 1250 at 8 ohms each. Is the Crown xti 4000 enough to power them both? How should I connect the system? Should I run it in bridge mono mode? Also, I have 2 Electro Voice 15 inch 300 watt speakers for my mains. I am planning on powering those with a QSC GX5. Do I need a separate crossover for this system or can I just use the built in crossover in the Crown xti 4000? How should I wire the system? Mixer to xti 4000 then line out to the QSC GX5? Thanks.