There have been several threads comparing the performance of the Crest CA9 and the QSC PLX over the past few months. Aside from experience opinions (which matter a lot), it seems difficult to separate the wheat from the chaff. 1st question: is the difference in performance due to differences in the input sensitivty? If so, shouldn't we be comparing the performance between the CA9 and a PowerLight which includes an Input Sensitivity adjustment capability? If not, is it just simply the mass of the output transformers. I can't tell whether everyone is trying to be diplomatic or just don't know the answer. However, given the weight considerations, this seems like a pretty important issue to get square on (if possible).