The Rear Protection Plate, which is made of sturdy sheet metal, not only protects the electronics of the LINEAR 9 118 Sub BA from splash water, but also from unauthorised access in Cardioid mode. Thanks to the keyholes, the wing screws only need to be loosened slightly to remove the plate. The grille required for ventilation of the electronics is backed with acoustic foam, effectively protecting connections and controls. The acoustic foam also darkens the LEDs, which is helpful in Cardioid operation on dark stages, but still allows the status of the LEDs to be seen.
