Denon Home Subwoofer - Subwoofer with HEOS® Built-in | Denon - US
Tiga 12" Subwoofer Kit Parts List | Wagner Online Electronic Stores
Dayton Audio 6-1/2" Down Firing Active Mini Subwoofer Kit with 2.1 Channel Amplifier 60 Watts
Copperhead with Subwoofer 2.1 Channel Powered Desktop Speaker System Kit
Amazon.com: HiVi-Swans DIY 3 Way Passive Bookshelf Speakers Pair - DIY Speaker Kit-Peak Power 120 Watt Home Theater Bookshelf Speakers for Surrounds or Front : Electronics