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ScanSpeak Illuminator 7″ Paper Cone Woofer 18WU/8741T-00 •Under hung voice coil •Neodymium magnet •Exceptionally long linear excursion •paper cone •8 ohm The Illuminator woofers are based on compact under-hung motor systems with large neodymium ring magnets. The patent pending motor offers a very long linear excursion together with a very high force factor. The top plate is shaped to “guide” the backside airflow around the motor and with the very open cast aluminum chassis design the driver is virtually free from compression. Recommends: • Sealed box of 0.4 cubic feet for an F3 of 70Hz • Vented box of 0.5 cubic feet with a 2″ diameter vent by 8″ long for an F3 of 54Hz • Vented box of 0.75 cubic feet with a 2″ diameter vent by 8&qu ot; long for an F3 of 48Hz