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 room. Plenum-rated 45W stereo amplifier provides excellent performance and produces crisp, clear audio. 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 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.