Mackie SRM150 5.25-Inch Compact Active PA System, Black Extremely portable active loudspeaker system Built-in Mackie mixer for superior sound quality with 3 channel mixer w/ 3-band active EQ Two high-headroom Mackie Mic/Line Preamps w/ 48V Phantom Power Instrument Ready input Dedicated Stereo Channel for Keyboards, CD, MP3, iPods, etc.