Hey everyone...I'm interested in finally purchasing my first bass rig. I'm looking at a QSC RMX850 power amp and mating it to either an Avatar 4X10 or 2X12 cab. My question is if the rig would function like this, or if I would need a preamp as well (I guess the real question is if I could plug into the poweramp directly or not). I play a Stingray5 (if that means anything) and just want to know if a preamp is simply for tone shaping or if it is needed for more than that. Thanks!