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
Sealed Servo Subwoofer (Single) | GR-Research
Rythmik F18 SE Direct Servo subwoofer 18″ - Choy Audio Visual
VELODYNE FSR-12 SERVO SERIES SUBWOOFER Driver. Ottime condizioni | eBay
Servo Sealed Kit and Flatpack (Single) | GR-Research
Servo-Controlled Bass | Genesis Advanced Technologies | United States