The RPA-4 from Nady is a compact complete one-piece portable four channel sound system with built-in powered mixer and speaker. Features include collapsible/locking handle, built-in rollerblade wheels, Four mono balanced (XLR and 1/4 inch TRS )inputs, 100W of RMS sound, 10 inch woofer, 5 1/2 inch midrange speaker, and compression dome tweeter, gain, reverb, and contour controls, master volume, high, mid and low EQ controls, DSP reverb with level and depth controls, 1/4 inch effect send, return, and line out jacks, RCA tape in/Rec Out, and a rugged enclosure with vinyl cover,carrying handle, and basemount for mounting on a speaker stand.