The set comes complete with bass-midrange drivers, tweeters and cable set (with integrated crossover) and lots of installation material (because of different. Vehicles). When installed in the Polo, I can only praise the set: The sound is far better than in the original Blaupunkt boxes. Unlike other opinions in the Polo Forum I find the bass rich. Clear - low bass can not be expected in the speakers, but if you want to fill, just comes to a subwoofer or a professional boxing board not rum as rear shelf. And the high places come precisely than the originals. Installation Tips for Polo: Wrap the plug below the bass-midrange driver with the included self-adhesive foam rubber. The are usually right on the sheet, which can then cause it rattles in the door.