Additional Details ------------------------------ Product description: Pairing with the new CyberData SIP Paging 25V/70V Amplifier, these Analog Ceiling Speakers 25V/70V/8 Ohm provide an economical solution to significantly expand sound coverage. The speaker offers selectable constant voltage at 25 or 70 volts, along with a standard 8 Ohm setting. Each speaker is pre-set with 5 power tap options, making installation simple. Multiple speakers can branch off a single home run cable to the amplifier. Key features include support for 25V, 70V, or 8 Ohm power input, adjustable dB output with multiple power tap settings, high-efficiency speaker drivers, clear speech intelligibility, suitability for background music, and easy installation with a seismic tether bracket for stability. Specifications include modes of 8 Ohm, 25V, 70V, 8 Ohms direct impedance, 20 watts continuous power handling, 25V, 70V, or 8 Ohm power input, 8 Ohm audio output, 25V and 70V power taps, a frequency response of 100 to 20000 Hz, operating range of -40C to 55C (-40F to 131F) temperature and 5-95% non-condensing humidity, storage temperature up to 70C (158F) and altitude up to 15,000 ft (4573 m), dimensions of 9.93 in (252.2 mm) grill diameter, 8.66 in (220 mm) can diameter, and 5.74 in (145.7 mm) can depth, a weight of 4.6 lbs (2.09 kg), and a 2-year limited warranty.