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Truth, my life was changed after getting these subwoofers. Gr research open baffle servo sub with magnepan 1.6qr. (Also with the gr research crossover) seem less transition between them, unless you want
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Velodyne Servo F-1800R II Subwoofer - 600W And MONSTROUS 18" Driver
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Velodyne DD10 10 Inch Servo Subwoofer Driver Only | eBay
Velodyne 10 Inch Servo Subwoofer Driver Only | eBay