I've been planning out a Shiva SonoSub for a while now, and was thinking of going with either the Amp350 or AVA250 plate amp to power it. I have heard alot about QSC apmlifiers and how good they are, and the price/power ratio is better than the plate amps, 830 watts @ 4 ohms mono for $500can. My question is this, what, if any, crossovers, EQ's, etc etc would I need to have an optimal working powere subwoofer. Is there any difference to the crossover's used on the QSC or the AVA250/amp350?? I've been nothing but confused about all this Linkwitz riley talk etc etc, so if someone could clear it up for me that would be greatly appreciated!