MODEL D215s Subwoofer: Dynamic, Accurate, Solid. The audiophile’s choice. Where sound quality and Transients free of overhang are paramount. Simply no better expression of bass performance then our push-pull subs. Ground up drivers developed by our team of engineers. Carbon fiber composite diaphragms, multiple aluminum shorting rings, massive magnets, multi-layer Nomex spiders and lightweight aluminum voice coil wire are the key ingredients – Proprietary nonlinear modeling techniques allow us to simulate all these components and then optimize for real world driver performance – free air and in box. Further refinement is done with the aid of Klippel laser measurements to dial things in. To take performance to another level, the push-pull drivers reduce even order harmonics distortion by an additional 10-12dB. Powered by our 3.0kW amplifier, all functions and safeties are controlled by a 48-bit data bath DSP and 32-bit ARM M4 Cortex processor, able to react in microseconds, powerful enough to slam. All D-Series subs share our 2.4” LCD touchscreen display and ability to control advance settings using our App. Certified by THX Dominus, The D-Series subs are the world’s first. A testament to the level of design and performance achieved.