RPA Series, 4-Channel with reverb! Compact ("take anywhere") complete one-piece portable sound systems with built-in powered mixers and speakers, collapsible/locking handle and built-in rubber rollerblade wheels-perfect for smaller room PA applications. RPA-4: 80W RMS @ 4 ohms, 4 mono balanced (XLR and 1/4" TRS) inputs and 10" woofer and dome tweeter.