Underperformance to a new level, these categories there are some radical improvements. As from scratch gives you the opportunity to tailor the end product that you need. They asked for more power - you did it! They wanted more at the bottom of the bass - you did it! More importantly, these subwoofers are more durable and will last longer than earlier models. All of this is due to Kapton molding machines wrapped around with copper voice coils, butyl rubber, polypropylene cone, and, above all, a good design.