Installing some I.D. CXS comps on a PPI900.4 with a clarion cz702 HU. The HU and the amp both have the ability to run components active. But my stock speakers in the back are terrible and practically blown. So should I the comps with the passive crossover then have the 2 rear channels open for my rear 6.5s in the door for rear fill? Or use all 4 channels of the PPi amp to run the CXS comps active, then mabey just have no rear fill or run them off HU power? SUggestions?