Niles OS5.3SI White (Each) 5 Inch Stereo Input 2-Way Indoor Outdoor Speaker (... Niles once again raises the bar. With our first OS Indoor/Outdoor models we revealed a radical new understanding of loudspeaker capabilities. Niles original OS Indoor/Outdoor loudspeakers are constantly praised for their ability to deliver exemplary reliability and outstanding sound quality. These attributes have made Niles OS Indoor/Outdoor loudspeakers the best selling loudspeakers in their class. Woofer Technology Integrated woofer/baffle assembly increases cone area to provide powerful bass output 5 Mica-filled polypropylene cone is extremely rigid to reduce breakup and lower distortion Butyl rubber cone surround damps resonance and provides exceptional durability Dual voice coils deliver both left and right channels from one speaker Tweeter Technology Stereo Imaging tweeter array directs the high frequency sounds from both the right and left channels into a space from one speaker Dual 1" UltraSilk(TM) domes with fluid-cooling and ultra-wide dispersion for clear and detailed high-frequencies. Recommended Amplifier Power 5W 100W per channel. Nominal Impedance 8 ohms per channel, wired in stereo or 4 ohms with both channels wired together. Frequency Response 85Hz 21kHz +/-3dB Sensitivity 90dB for 2.83V pink noise. Wiring Requirements Sixteen to eighteen gauge 2-conductor (unshielded or shielded) wire for runs up to eighty feet. Fourteen gauge 2-conductor (unshielded or shielded) wire for runs up to two hundred feet. Dimensions (Loudspeaker with U-Bracket) 12 high x 7-7/16 wide x 7-3/4 deep Weight (Loudspeaker and Bracket) 9 lbs.