I'm in the market for a power amp. Stereo perhaps. I've never used one before. In reading about them I've seen some verbage that confuses me. 'Both channels driven...' Assuming that I would run the power amp in bridged mode. Does this mean that I need to "Y" the output off of my pre-amp (one into each side of the power amp) in order to effectively drive the power-amp? or Do I just run the single output from the pre into one side of the power? Thanks.