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Monoprice [monoprice.com] has Monolith by Monoprice M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer on sale for $ 1296.25 w/ code MARCH15. Shipping is free.[list][*]Model: 38543[*]Woofer: 2x 15" cone[*]Cone Materia: 2‑layer long fiber pulp/glass fiber cone[*]Amplifier: 2000 watts (RMS)/3600 watts (peak)[*]Frequency Response: 14~200Hz (Extended) 16Hz~200Hz (THX®)