Hey guys. I have a Parasound AVC2500 Pre/Pro, that I have my SW12II hooked up to. This sub does not have the ability to turn off the crossover. Now I just sent my Parasound in to have the Bass Management/xover upgrade performed. I can select 1khz/80hz, 1khz/40hz, 40hz/40hz, or 80hz/80hz as my crossover points. Parasound says that I should choose one of the first two to use the xover in my sub...this will cut out double filtration. Would I be better off buying another sub that I can defeat the internal xover so that I can just use my preamp's. I would appreciate your help. Thanks