AtlasIED FAPSUB-1 - 8-Inch Tuned Ported In-Ceiling SubwooferThe FAPSUB 1 adds impressive low frequency response to any full range distributed system. The FAPSUB 1 consists of a highly efficient 8", 8 ohm subwoofer designed and built by AtlasIED to work optimality in the FAPSUB 1 enclosure system. A highly efficient, 3 pole filtering network eliminates unwanted high frequencies from the woofer and provides bass response down to 45Hz (10dB). A special low saturation 70. 7V 100V transformer is included with 1. 9,