I'm using a QSC RMX850 with a SansAmp RBI trough an Ampeg BSE410HLF cabinet. Look at the attached picture of my settings. The power amp is bridged for 830w at 4 ohms The cab is a 4 ohm cab. If I turn the power amp up (left knob on power amp) any more than shown in the photo it clips. If I turn the level or Drive on the SansAmp any more than shown in the photo it clips. ***!!!!?????? I've disconnected the BBE and Craptacular Alesys compressor to rule them out. Could it be the cabinet?