Hey fellas I have decided to start experimenting with a pre-power setup. Here is the story: I have a schroeder 1210 and a 1212 cab that I want to power with a QSC PLX 1602 that has been sitting in my closet for a couple of years. I just recieved a mint conditon Sansamp RBI from a fellow TBer. I love the sansamp as an effect but figured I would try it out as a pre amp with my QSC to see if I will have enough power to push the Schroeder cabs ( 500 watts stereo @4 ohms, 4 ohm cabs) But first I have some questions: Does anyone here use the filters on the QSC power amp or do you run it full range. I play mostly 5 string bass and dont know whether to engage the 30hz roll off filter or not. Also how much pre amp signal do I send to the power amp ? And how much power do I send to the speakers. I have no way of knowing how much input from the Sansamp I need ( I am used to having a pre amp clip light). I have meters for the power output of the amp, so I guess I am ok there. I ultimately plan on getting an Eden Navigator as a pre amp but figured I would try the Sansamp first.