Hey All, I have posted a few times about my low budget PA system. Currently I have: (2) Behringer VP2520 2x15 Mains 500w RMS (4) Zebra 250w RMS monitors Behringer XYNEX 2442FX Mixer Behringer EP2000 amp Cheap 1000w Ap to run the monitors I picked up a Behringer EP4000 amp off zzounds (price beat Walmart price so got it for $271). I don't plan on changing the mixer or amps at this point, maybe eventually. Today I picked up a pair of Carvin 942 15" mains which are 400w at 8ohms. My plan is to run the two Carvin mains off channel A of the EP4000 (1400w per side at 4ohms) and find two other mains to run off channel B of the EP4000. I would then add two 750w or so subs and run them off the EP2000. A couple questions: 1.) Does this make sense? 2.) Will two 750w subs be acceptable with say two 400w mains and two 600w mains or should I try to get another EP4000 to run subs at the same wattage as the mains? 3.) Any suggestions for cheap (but better than Behringer) 600w RMS mains to add to this setup? 4.) Any suggestions on subs in the 750w range (or 1000w+ range if needed in question 2) at a reasonable price? I am keeping this as low budget as possible while still trying to upgrade my setup. Is this even an upgrade? I am assuming it is as the Carvins sound nice and the subs will add more low end than the 2x15 Behringers could produce. Thanks in advance!