High quality, direct radiator speakers, 7 watts and 15 watts power handling capacity, Provision for quick attachment of transformer, Available with transformer mounted and wired,The Bogen Models S86 and S810 8" cone-type loudspeakers provide excellent sound quality and troublefree operation. Their magnetic structure is designed for maximum air gap energy and the diaphragms have been selected for high sensitivity and optimized response characteristics. The speakers are easy to install in ceiling grilles or wall baffles. Mounting holes have been provided for quick attachment of a transformer. Transformers include the Model T725, which matches an 8-ohm speaker to a 25- or 70-volt line with six power taps for either voltage (4, 2, 1, 1/2, 1/4, and 1/8 watt), and the Model T72510 which matches an 8- ohm speaker to a 25- or 70-volt line with five power taps for either voltage (10, 5, 2-1/2, 1-1/4, 5/8 watts)