Sonance IS8T Surface-Mount Speaker Audio for Indoor/Outdoor Use Invisible Speakers are the pinnacle of the Sonance ?Designed to Disappear? strategy. High frequencies are achieved with Sonance?s ?Motion Flex Technology?, which consists of a ?Wave Flex Drive Unit? with a bending wave diaphragm, utilizing a 1.75? (44mm) voice coil, while the low frequencies are generated by an ?Air Flex? Woofer with an air pulse diaphragm driven by an 8? (203mm) carbon fiber woofer. Key Features 6 Ohms nominal impedance with select models?for professional use (IS6T and IS8T feature Sonance?Laminated Core Transformer for 6 Ohm/70v/00V tap selection) 180 degree sound Motion Flex Technology features acoustically isolated baffle, Air Flex Woofer and Wave Flex Drive Unit for superior detail and range Sonance CDX Crossover Design - Warmth and detail at all volumes Accepts up to 3mm topping compound Install into drywall, select plasters, wallpaper. leather, and wood veneer applications Sonance DISC Depth Identification Sensing Calibration System to measure and standardize finish and performance Limited 15 Year Warranty valid on Invisible Series products purchased from an authorized Sonance dealer or distributor Specifications Color White Wave Flex Drive Unit 29in^2 (188cm^2) bending wave diaphragm, 1.75in (44mm) voice coil Air Flex Woofer 191in^2 (1234cm^2) air pulse diaphragm, 8in (203mm) carbon fiber woofer Frequency Response (+/- 3db) 40Hz - 30kHz Power Handling (RMS) 160 watts RMS Sensitivity 86dB (2.83V/1m) Nominal Impedance (Ohms) 4 Ohms Dispersion 170 degree hemispherical up to 10kHz Transformer Taps 70 V / 100 V: 60W, 30W and 15W 70 V: 7.5W Dimensions (WxHxD) 16.1" x 24.13" x 3.86" (408.94mm x 612.9mm x 98.04mm) Dimensions No Feet (WxHxD) 16.1" x 24.13" x 3.86" (408.94mm x 612.9mm x 98.04mm) Mounting Depth 3.39" (86.11mm) Weight 25.24 lbs. (11.45kg) Certifications UL2043, UL1480 Attachment Screw Terminals with strain relief Overload Protection Two independent self-resetting poly switches