I have buy a QSC GX7 in 8ohm is725 watt and in 4ohm is 1000w my speakers is 500rms, 1000 program peak 2000w peavey i want to know if i can use the QSC power amps with these speakers or change these speaker into 4ohm to get the 1000 watt or the will be fine with the 8ohm in 725w