i know you said you had one before, but how are the settings for biamp, full range and stereo...you have to pan the preamp all the way to one side or the other...also, if you're bridging your poweramp, you only need to use one volume control on the panel...if you use both knobs, one volume knob will counteract the effect of the other...that's how it worked on my crown, anyway...also, the left and right DI's (XLR's) are a little hotter on the preamp than the 1/4 main outs...man, up until a couple weeks ago, i had pictures of the back of my navigator using the effect loop and tuner out with all of the different combos of how you can set it up with the poweramp...unfortuantely, i got rid of the navigator and picked up a mesa 400+ a few weeks ago