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. The Monoprice MPA-25-WH powered stereo loudspeaker is just such a speaker set. The MPA-25-WH consists of an active loudspeaker with a custom amp built in for one channel and a passive slave loudspeaker for the other in order to complete the stereo pair. It is an ideal choice for AV applications such as meeting rooms, multi-media usage and even for small presentations. The active loudspeaker package is designed with volume and tone controls and accurate clip indications with built-in a stereo Class D 2x30 watt amplifiers. They are also magnetically shielded to prevent interference with other devices. Optional Functions -Aux automatic power on/off. -Remote volume control