Provides crisp audio in a compact design with HummBuster™ technology Audio amplifiers are required in commercial and educational environments to boost line level audio from laptops, DVD players or other electronics to drive speakers that evenly disperse sound throughout the room. This plenum-rated 45 Watt stereo amplifier provides excellent performance and produces crisp, clear audio. Its unique heat-sink design provides effective heat dissipation which allows it to be used in areas of high temperature and low air flow such as plenum boxes. Integrated Hummbuster technology allows the amplifier to filter hums and ground loop issues that can compromise sound quality and have traditionally plagued audio systems. Power and performance combine in this device to ensure quality performance while staying on budget. Input: Two RCA Female, One 3.5mm Stereo Female Output: Four Phoenix