I've downsized to a townhouse and can no longer use this amazing subwoofer. It has had very limited use.
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Owner's manual (with pictures) here: https://3634088.app.netsuite.com/core/media/media.nl?id=555&c=3634088&h=e0e67fa1c11887c86e24&_xt=.pdf
Details from the SVS website.
Sledge STA–400D amplifier sports technology and features simply not found anywhere else at this price point. Starting with a conservatively rated 400 watts of DSP–controlled power – a perfect match for the rugged NSD–12 driver.
Finite Element Analysis (FEA)–optimized motor with dual shorting rings and pole extenders to reduce gap induction and distortion. 2" diameter, high–power voice coil with high–temp former. Nomex linear–roll super long–throw spider. Exclusive SVS aluminum cone and composite dust cap for excellent transient response and resonance control. Vented pole–piece for greater cooling, low noise, and reduced compression artifacts.
400 watts RMS continuous power (800 watts peak dynamic power). Efficient, cool–running Class D power with 'green' standby mode. Stereo line–level RCA input/output connections. Separate high–passed 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 PC12–NSD 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 deep–tuned port, the result is excellent deep bass performance and outstanding mid–bass 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. Down–firing driver provides a low center–of–gravity and excellent stability. Wide–flared 4" port for maximum air–flow with no artifacts. 20 Hz tuning for optimal extension and output on all source material.