The Electro-Voice? EVID C10.1 loudspeaker system is a complete low frequency ceiling subwoofer package. The C10.1 packs a large 10" subwoofer in a tuned high performance enclosure to give amazing low frequency performance down to 45Hz! The EVID C10.1 is designed to augment the low frequency response of any EVID ceiling speaker. The package consists of a bezel assembly, grille, rear enclosure, 10-inch loudspeaker and internal line-matching transformer. The EVID C10.1 loudspeaker utilizes a 2nd order crossover network to provide the correct bandpass frequency response for use with any EVID Ceiling loud speaker. The C10.1 utilizes a transformer that offers a selection of 7.5 (70-V only), 15, 30 or 60 watts delivered to the loudspeaker system using either 70-V or 100-V lines, or 8 ohm bypass. Selection is via a convenient switch on the front baffle. The perforated grille is finished in semi-gloss white powder-coated enamel. The baffle and bezel are constructed from UL 94V-0 rated ABS. The rear enclosure is constructed from zinc-plated, heavy gauge steel. The rear enclosure, with fiberglass damping material, provides an optimum internal volume for extended low-frequency performance. A rear cover, with provisions for a junction box fitting, provides access to a 4-pin terminal block that allows direct connection to the speaker with 12 GA wire and provides full-range pass through to additional speakers. A tile bridge is included for safe suspension of the C10.1 ceiling systems in a drop ceiling that uses mineral wool, or other fiber-based ceiling tiles. The EVID line of ceiling speakers has been designed to work together as a complete system in a wide range of different ceiling constructions. They provide wide dispersion, high-efficiency, high-maximum output, ease of installation, and wide-range