Your new deck should have a high pass filter that you can turn on to limit the bass reproduction of your front speakers, I would also question the amplifier for your subwoofers, as it seems to be lacking the correct power and the infinity kappa speakers if they are truley 2ohm you will more than likely blow your stock amplifier. or over heat your deck as somtime the resistance backfeeds through and will overheat your deck as well..also don't forget to install a grounding kit to overcome to extra power draw from the stereo. A true 4ga amp kit is recommended as well as making the ground kit 4ga too..