Amazon offers the Polk Audio PSW10 10″ 50-watt Powered Subwoofer in Black for $83.88 with free shipping.
- Single 10-inch subwoofer in black with built-in high-current amplifier for big bass
- Equipped with one 10-inch polymer-composite dynamic-balance cone driver
- Laser-based Klippel measurement technology for improved linearity and deep, precise sound
- Non-resonant all-MDF enclosure construction with 0.75-inch-thick baffles and internal bracing
- Measures 14 by 14.38 by 16.12 inches (WxHxD)