SVS PC12 NSD 12-inch 400 Watt Powered Cylinder Subwoofer Our Sledge STA400D amplifier sports technology and features simply not found anywhere else at this price point. Starting with a conservatively rated 400 watts of DSPcontrolled power  a perfect match for the rugged NSD12 driver. Finite Element Analysis (FEA)optimized motor with dual shorting rings and pole extenders to reduce gap induction and distortion. 	2" diameter, highpower voice coil with hightemp former. 	Nomex linearroll super longthrow spider. 	Exclusive SVS aluminum cone and composite dust cap for excellent transient response and resonance control. 	Vented polepiece for greater cooling, low noise, and reduced compression artifacts. 400 watts RMS continuous power (800 watts peak dynamic power). 	Efficient, coolrunning Class D power with 'green' standby mode. 	Stereo linelevel RCA input/output connections. 	Separate highpassed and unfiltered line level outputs. 	Continuously variable low pass filter. 	DSP control for refined behavior under all operating conditions. With only a 16.5" diameter footprint, the PC12NSD will fit into almost any location, and no other subwoofer design offers more bass performance per square inch of floor space. Using vertical height to achieve a generous enclosure volume and a deeptuned port, the result is excellent deep bass performance and outstanding midbass slam  all in a very manageable size. Small footprint fits into tight locations and is perfect for the enthusiast with limited floor space. 	Slender vertical form factor results in generous enclosure volume for efficient reproduction of the deepest bass notes. 	Downfiring driver provides a low centerofgravity and excellent stability. 	Wideflared 4" port for maximum airflow with no artifacts. 	20 Hz tuning for optimal extension and output on all source material.