Perfect for pairing up with the Yamaha HS8 monitors, the Yamaha HS8S is a powered subwoofer capable of producing frequencies as low as 22Hz. For such a classic-looking black box, the HS8S has an array of features and capabilities. Its 8" driver is more than capable of handling thundering lows, and the unit itself has an internal 150W amplifier, along with appointments like polarity inversion, filtering capabilities like high and low cut, and continuous level control. Upgrade your HS8 system with its powered subwoofer, the Yamaha HS8S.