I agree with desi. There is nothing wrong with using different brand names. I would keep the higher range speakers the same for tonal matching. But as far as amps, head units, x-overs, or even equalizers are concerned - take your pick. For instance: Audio Control makes some of the best processors around but they don't make speakers, head units, or car amps.well how about not 1 company makes EVERYTHING the best, so say get fronts n backs same company but then change it up for the amps n then again for the decks etc....