With its Plus One™ (patent pending) woofer cones, this subwoofer features more cone area than that found on competing subwoofers of the same size. This increase in cone area delivers an audible increase in bass output and efficiency. The JBL® P1022 also features a proprietary die-cast frame that ensures that the motor structure stays centered in the voice-coil gap, ensuring long-term reliability and durability. Stitched-in tinsel leads are used to greatly enhance reliability and eliminate audible tinsel lead slap.