Brand NEW! Including 90 Days USA Factory Warranty. This Dayton Audio SA100 100 watt subwoofer amplifier with adjustable crossover, high and low level inputs, auto on/off and phase reversal switch is perfect for building your own powered subwoofer. This plate amp offers very stable operation, with full overload protection. Highlights ? Low distortion audiophile sound ? Adjustable low pass crossover ? High and low level inputs/outputs ? Auto On/Off ? Phase reversal switch ? 75 watts RMS @ 8 ohms, 100 watts RMS @ 4 ohms ? S/N Ratio: 90 dB (A-weighted) Small but mighty! The Dayton Audio SA100 high performance subwoofer plate amp module packs big-amp features into a compact chassis that is ideal for installation into cabinets that can't accommodate bulky old-style amps. We made it small, but included everything that you need to connect the amp to your system and get maximum performance. Input/output connections are through your choice of either line level RCA connectors, or speaker level banana jacks. A stereo input signal is summed to mono and sent to the internal low pass crossover, which is selectable from 40 to 180 Hz; the input gain sensitivity is fully adjustable as well. The SA100 also includes a phase reverse switch, which helps you to achieve the best acoustical match with the rest of your speakers. An Auto On/Off switch keeps the amp standing by, waiting for an input signal to turn it on. A large surface area heat sink is combined with internal overload, thermal, and short circuit protection so that you can expect years of reliable operation. Specifications: ? Measured power output: 75 watts RMS into 8 ohms @ 0.1% THD, 100 watts RMS into 4 ohms @ 0.2% THD ? Signal to noise ratio: 90 dB (A-weighted) ? Dimensions: 7-1/2" W x 8-11/16" H x 4-3/4" D ? Enclosure cutout: 6-1/2" W x 7-1/2" H ? Power requirements: 120 VAC, 60 Hz, 210 watts ? Net weight: 7.6 lbs. - All international buyers are responsible for all tax, duties and/or customs fees.