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The black ICC-4H Couplers from TurboSound includes a pair of couplers for linking two TCS-B15 subwoofers horizontally. The subwoofers to be linked can be either version A or version B, but both need to be the same. In addition, each subwoofers would need a pair of FP-2 flyplates fitted.
In the Box
Turbosound ICC-4H Couplers for TCS-B15 Subwoofers (2 Pieces, Black)