Wow! This thing is sweet!! I started with my Jazz Bass and I was able to crank the level on my SansAmp RBI up almost all the way without clipping the power amp (QSC RMX850) which made me almost pass out . So I swapped basses and rocked the Warwick through it and wasn't able to use the same levels. I found that I should be using the -20 pad on the 2nd input for active siginals. I can't get the same volume with the Warwick in input 2 (padded)as with the Jazz Bass in the 1st input. Withe the SansAmp RBI level cranked to about 2 O'clock the speaker cones move quite a bit and the sound is quite percussive. Is this bad for the speakers? They really MOVE !!! The amp isn't clipping and with an 8ohm load puts out 600watts (100 less than the cab is rated for).