Active loudspeakers eliminate the need for a separate power amp providing easier installation options than when using traditional passive speakers. They also have the advantage of having an amp that is custom tuned to the speakers they are driving.This Monoprice powered stereo loudspeaker is just such a speaker set. It consists of an active loudspeaker with a custom amp built in for one channel and a passive slave loudspeaker for the other, to complete the stereo pair. It is an ideal choice for AV applications such as meeting rooms, multi-media usage, small presentations, and even as a powered speaker for your computer or portable music player. The active loudspeaker package comes with volume and tone controls and built-in a stereo Class D 2x 30 watt amplifiers. They are also magnetically shielded to prevent interference with other devices.