I am trying to build a decent PA for a cover band that I am in. We are ready to gig in few weeks. I am trying to use the passive speakers and gear that we have collectively. Later down the road I am looking into powered JBL cabs and a Mackie passive mixer, but to get us started I am trying to use what we have. Yamaha EMX512SC powered mixer Yamaha BR12M (4 each) JBL JRX118 (2 each) We can do a small gig with two BR12Ms for mains and two for monitors using the internal amps in the mixer. That would mean that we only put vocals, guitars, and maybe the kick in the front mix. Not the best but it will work. I want to get a full sound and use the subs. I believe the only way to do so is to use a pair of power amps with built in crossovers as I have shown in this cheesy diagram. So here are my questions: Will this design work ok? If so, what amps would you suggest? Is there a single beefy enough amp that could pull this off instead of two? Should I place the tops on stands and place the subs together in the center of the stage (or either side)? I am looking at these amps. The Behringers look attractive due to their weight! Behringer NU3000. $299 each, 4 Ohm per side at 880 Watts. 8.75 lbs QSC GX3. $299 each, 4 Ohm per side at 425 Watts. 27 lbs QSC GX5. $399 each, 4 Ohm per side at 700Watts. 28 lbs Thanks in advance!