this is specifically for users of the GK 800RB. I tour with one and use and 8x10. I want a smaller rig (i.e 2 - 2x12's) so i don't have to use the fridge for smaller venues. I tried the Bi-amp feature this past weekend using an ampeg 4x10 and an SWR 1x15. I have always felt SWR speakers couldn't hang with much power, and the grunts coming from the 1x15 cab were exactly that. Even after i switched the 1x15 to the 100 watt power section it still sounded weak. and "floppy". the 1x15 cab is perfect and sounds good by itself, and so does my own 4x10. my amp is in working order as well. So, how do i use the crossover (frequency knob) to ensure i get the most from the cabs? i'll keep the 8x10 if it's not gonna work very well..