Now you can enjoy the highest quality sound even on the go, with a set of Pioneer TS-A1685R 6.5-inch four-way car speakers. Designed to fit 6.5-inch or 6.75-inch mounting holes, these speakers transcform your dull factory sound into something your ears will love. Start with the mica-matrix woofers, engineered for stiffness even at full volume. Move up to the 3/4-inch midrange, and then the 3/8-inch tweeter and supertweeter that carry the sound to highs your dog can truly appreciate. If these speakers show up your factory system, don't worry; you can always connect them to a third party stereo or a dedicated amp to really show off their sound.