Sony Core Series 10" 115W Active Subwoofer Black SACS9 - Best Buy
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Monoprice 8in 60-Watt Powered Subwoofer, Black - Monoprice.com
Carvin TRx3118A 2000W Active 18-Inch Subwoofer - Carvin Audio
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Pioneer TS-WX1210A - Sealed 12" 1,300-Watt Active Subwoofer with Built-in Amp - Walmart.com
Dayton Audio 6-1/2" Down Firing Active Mini Subwoofer Kit with 2.1 Channel Amplifier 60 Watts
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Audioengine S6 Powered subwoofer at Crutchfield
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Alpine 8" Powered Subwoofer System Black PWE-S8 - Best Buy
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Alpine PWE-S8 Compact 120-watt powered 8" subwoofer at Crutchfield
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PreSonus Temblor T8 Active Subwoofer | KraftMusic.com