Amazon.com: KRK S8.4 8 inches Powered Studio Subwoofer Class D Power amplifiers 4-Position Crossover Frequency and 109 watts of Power with Pair of EMB 1/4 in Cables and Magnet Phone Holder Bundle :
KRK SYSTEMS - S8.4 Powered Studio Subwoofer
KRK S8.4 Powered Studio Subwoofer - Perfect Circuit