I am looking to upgrade my sound without an amp or audio processor with the factory HU if I can get away with it. I want to add a Pioneer wh-500 as it comes recommended from others here to put under the seat, but I am worried that tapping the front speaker wire on one side will make the audio uneven and then being unable to adjust my crossover freq between the components and the sub. If there is a good way to upgrade the speakers without an amp that would be excellent as well.