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The GP212-sw is a premium, high- performance, rectangular dual 12 " 4th order band-pass subwoofer designed for ground stacked use in touring or installed concert applications where space constraints or enclosure size are an issue. With an impressive combination of punch, low- frequency extension and musical accuracy, the GP212-sw is an ideal companion for QSC?s acclaimed WideLine series as well as other professional sound reinforcement systems.