The Yamaha MSR-250 powered speaker gives you 200 watts of power in a relatively compact cabinet (12 x 14 x 21 inches). Can be used as an instrument amp, or as a PA speaker. Main channel is mic or instrument, then channel 2/3 will take a stereo input, or another instrument. Of course, it is also designed to be put on a speaker stand as a PA speaker, using output from a separate mixing board. 1 inch tweeter, 10 inch bass reflex woofer.