MA 500 USB is a stereo amplifier with 150W per channel. In the rear part two RCA line inputs, rec output and its front panel the USB, SD reader and Bluetooth interface. The unit also incorporates 5 microphone inputs, including 3 Jack 6.3mm on the front panel and two XLR in the rear. The user can modify the gain control of each of the microphone signals, plus the ability to add effects such as echo, delay and tone (bass and treble). In the front are various controls such as master volume, the overall volume of the input signals and controls management as the mode USB interface and control audio tracks.