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OSD Audio SMP200 Class D Digital Subwoofer Amplifier Rated 200W MaxOSD Audios SMP200 Class D Digital Subwoofer Amplifier is rated at 200W max power and designed to power passive subwoofers used in home theater audio systems. This tiny but mighty" powered sub measures less than nine inches wide and 10 inches deep but supplies an in-wall or stand-alo..