I need a little advice on what the best way to wire two preamps together is. I currently own an ada mb-1, powered by a Mackie 1400i into 2 mesa boogie RR 4x10 cabs. Pretty soon I'll be buying a svt-pro preamp and I'm not sure how to tie all this together. I'm sort of sure my bass will run out to the ampeg then ada and finally the mackie, but if theres a better way I'd love the advice. Do I do some kind of cross wiring between the preamps with the a send, b recieve or the a recieve, b send ports in the rear of the ada?