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
Velodyne Servo F-1800R II Subwoofer - 600W And MONSTROUS 18" Driver
Velodyne DD10 10 Inch Servo Subwoofer Driver Only | eBay
Rythmik Audio F12G Direct Servo Subwoofer In-Depth Review
Velodyne Servo F-1800R II Subwoofer - 600W And MONSTROUS 18" Driver
Velodyne 10 Inch Servo Subwoofer Driver Only | eBay
Rythmik L22 Dual 12" Driver HT/music Direct Servo subwoofer
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Velodyne 10 Inch Servo Subwoofer Driver Only | eBay
Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor | audioXpress