Creative ZiiSound DSx Wireless Subwoofer for ZiiSound Modular Speaker Systems Works with ZiiSound D5x or ZiiSound D3x for extended deep bass capability Incorporates Creative Symmetrically Loaded Acoustic Module (SLAM) for that signature deep, tight and fast bass Robust wireless technology allows limitless flexibility in subwoofer placement (AC cord required) Links up with multiple ZiiSound D5x, D3x or DSx (D5x can only link with other D5x, D3x can only link with other D3x) for a full 4 piece, 3.1 setup Creative ZiiSound DSx modular subwoofer Works with ZiiSound D5x or ZiiSound D3x for extended deep bass capability Incorporates Creative Symmetrically Loaded Acoustic Module (SLAM) for that signature deep, tight and fast bass Robust wireless technology allows limitless flexibility in subwoofer placement Links up with multiple ZiiSound D5x, D3x or DSx for a full four piece, 3.1 setup